Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2006-10-12
2008-03-18
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C342S457000
Reexamination Certificate
active
07345630
ABSTRACT:
In a position detection system for detecting a position of a terminal apparatus of a radio communications system, a position detection time is shortened using a position detection method for determining signal times-of-arrival between the terminal apparatus and base stations neighboring the terminal apparatus. According to the present invention, means for generating a database in which received power information about signals transferred between the terminal apparatus and the base stations neighboring the terminal apparatus corresponds to position information about the terminal apparatus, and for determining the position information by searching received power information obtained in the position detection from the database, and means for determining the position by use of signal times-of-arrival are executed in parallel. Then, the use of a result of the means which has detected the position earlier than another means shortens the position detection time.
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A. Ogino et al, “Integrated Wireless LAN Access system—Study on Location System”, 2003 IEICE General Meeting, p. 662.
Katsuhiko Tsunehara et al., “Integrated Wireless LAN Access System—Study on Position Location Accuracy”, 2003 IEICE General Meeting, p. 663, with English translation.
Ogino Atsushi
Tamaki Tsuyoshi
Uta Takaki
Yamasaki Ryota
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi , Ltd.
Phan Dao
Reed Smith LLP
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