Patents by Inventor Ryota Yamasaki
Ryota Yamasaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7353032Abstract: A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.Type: GrantFiled: December 4, 2006Date of Patent: April 1, 2008Assignee: Hitachi, Ltd.Inventors: Atsushi Ogino, Takashi Yano, Katsuhiko Tsunehara, Ryota Yamasaki, Masaaki Shida, Hideya Suzuki, Nobukazu Doi
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Patent number: 7345630Abstract: 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.Type: GrantFiled: October 12, 2006Date of Patent: March 18, 2008Assignee: Hitachi, Ltd.Inventors: Tsuyoshi Tamaki, Atsushi Ogino, Takaki Uta, Ryota Yamasaki
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Patent number: 7266098Abstract: A method and system for detecting the position of a mobile unit efficiently and with high precision in a multipath environment. A wireless position detection system made up of a mobile station containing a wireless communication means to allow sending and receiving multiple to and from mutually different antenna positions and, a base station for performing wireless communication with mobile stations containing a wireless communication means and, multiple wireless receivers for receiving each of the multiple signals sent by the wireless communication means between the base stations and, a server for detecting the position of the mobile station from each wireless receiver and from the position of the base station, and the time relating to received signals measured by the multiple wireless receivers.Type: GrantFiled: October 4, 2004Date of Patent: September 4, 2007Assignee: Hitachi, Ltd.Inventors: Atsushi Ogino, Ryota Yamasaki, Katsuhiko Tsunehara, Naoto Matsuzawa, Hideya Suzuki, Takashi Yano
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Publication number: 20070090995Abstract: 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.Type: ApplicationFiled: October 12, 2006Publication date: April 26, 2007Inventors: Tsuyoshi Tamaki, Atsushi Ogino, Takaki Uta, Ryota Yamasaki
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Publication number: 20070087760Abstract: A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.Type: ApplicationFiled: December 4, 2006Publication date: April 19, 2007Inventors: Atsushi Ogino, Takashi Yano, Katsuhiko Tsunehara, Ryota Yamasaki, Masaaki Shida, Hideya Suzuki, Nobukazu Doi
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Publication number: 20070032248Abstract: In any indoor location, whenever operating a wireless terminal position detecting system comprising a transferable wireless terminal, a plurality of base stations individually allowing a connection from said wireless terminal, and a plurality of wireless receiving stations individually receiving wireless signal from said terminal and base stations, there is a problem in terms of the provision of a method for minimizing positional detection error on the part of said wireless terminal and a method for practically realizing said method.Type: ApplicationFiled: July 10, 2006Publication date: February 8, 2007Inventors: Atsushi Ogino, Ryota Yamasaki, Takaki Uta
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Patent number: 7167712Abstract: A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.Type: GrantFiled: June 18, 2003Date of Patent: January 23, 2007Assignee: Hitachi, Ltd.Inventors: Atsushi Ogino, Takashi Yano, Katsuhiko Tsunehara, Ryota Yamasaki, Masaaki Shida, Hideya Suzuki, Nobukazu Doi
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Patent number: 7139583Abstract: In a positioning system using the time difference of arrival of signals between a station and a plurality of access points, each of the access points repeatedly measures a signal for calculating a position from the station, while changing any of time, the position of the station, and a frequency in use, and accumulates a plurality of measurement data. A position calculation server determines a given timing on each of a plurality of delay profiles created based on the measurement data obtained from the access points as a reception timing sample for the signal, performs a combination process with respect to the plurality of reception timing samples, and determines one reception timing for each of the access points. The position calculation server calculates the time difference of arrival of signals between the station and the access points based on the reception timings and calculates the coordinates of the position of the station.Type: GrantFiled: January 9, 2004Date of Patent: November 21, 2006Assignee: Hitachi, Ltd.Inventors: Ryota Yamasaki, Atsushi Ogino, Masaaki Shida
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Patent number: 7138946Abstract: 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.Type: GrantFiled: June 15, 2004Date of Patent: November 21, 2006Assignee: Hitachi, Ltd.Inventors: Tsuyoshi Tamaki, Atsushi Ogino, Takaki Uta, Ryota Yamasaki
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Publication number: 20060234756Abstract: When one base station to which a terminal is to connect is determined from a plurality of base stations in a wireless communication system, the best base station is selected according to the communication quality or the content of communication services. In the wireless communication system, the plurality of base stations are classified into a plurality of groups. Indexes of communication quality between the base stations and the terminal are obtained and, for each group, the characterizing quantities of the indexes of communication quality are calculated. The base station group with which the terminal is to communicate is specified based on the characterizing quantities. One of the base stations in the specified group is determined as a communication destination base station.Type: ApplicationFiled: January 11, 2006Publication date: October 19, 2006Inventors: Ryota Yamasaki, Kumiko Takikawa, Atsushi Ogino, Takaki Uta
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Publication number: 20060105779Abstract: In a position detection system utilizing a WLAN supporting multiple data transfer rates, it is possible to reduce the number of required installed base stations, so system construction costs can be lowered. In a wireless station, a transmitted signal is judged at the time of transmission, and in case it is normal user data, the signal is transmitted by setting optimal transmission parameters for which a high communication throughput with wireless communication is obtained, and in case it is a position detection signal, the aforementioned signal is transmitted by setting transmission parameters for which the service range is increased. As a transmission parameter for which the service range is increased, a low data transfer rate or a long preamble length is used.Type: ApplicationFiled: November 8, 2005Publication date: May 18, 2006Inventors: Takaki Uta, Atsushi Ogino, Ryota Yamasaki, Kumiko Takikawa
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Publication number: 20050101331Abstract: A method and system are provided for controlling position detection of a terminal in a network. In one example, a wireless communications system operates as a position determination system to determine the position of a terminal, based on the measurements of time difference of arrival (TDOA) of radio signals sent from the terminal and received at a plurality of base stations in the vicinity of the terminal, while preventing the loss of packets sent from terminals to the base stations.Type: ApplicationFiled: June 16, 2004Publication date: May 12, 2005Inventors: Tsuyoshi Tamaki, Atsushi Ogino, Takaki Uta, Ryota Yamasaki
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Publication number: 20050090268Abstract: Method and device for detecting the position of a base station in mobile terminal positioning system, which improves the success rate for detecting the position and improves the detection accuracy. The device is composed of a memory to record the received signals, a counter to record the time the signals were received, and a register to temporarily store the counter values; and also a position module interrupt signal sent to the memory during recording of a signal, and a data link interrupt signal issued during data link processing, and a position module information table for recording information relating to the memory, and a MAC information table for recording information relating to MAC processing. The counter value is stored in the register during issue of a position module interrupt, and the counter value is recorded in the position module information table. The counter value stored in the register is stored in the MAC information table during issue of a data link interrupt.Type: ApplicationFiled: June 25, 2004Publication date: April 28, 2005Inventors: Ryota Yamasaki, Atsushi Ogino, Tsuyoshi Tamaki
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Publication number: 20050078033Abstract: 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.Type: ApplicationFiled: June 15, 2004Publication date: April 14, 2005Inventors: Tsuyoshi Tamaki, Atsushi Ogino, Takaki Uta, Ryota Yamasaki
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Publication number: 20050078626Abstract: A method and system for detecting the position of a mobile unit efficiently and with high precision in a multipath environment. A wireless position detection system made up of a mobile station containing a wireless communication means to allow sending and receiving multiple to and from mutually different antenna positions and, a base station for performing wireless communication with mobile stations containing a wireless communication means and, multiple wireless receivers for receiving each of the multiple signals sent by the wireless communication means between the base stations and, a server for detecting the position of the mobile station from each wireless receiver and from the position of the base station, and the time relating to received signals measured by the multiple wireless receivers.Type: ApplicationFiled: October 4, 2004Publication date: April 14, 2005Inventors: Atsushi Ogino, Ryota Yamasaki, Katsuhiko Tsunehara, Naoto Matsuzawa, Hideya Suzuki, Takashi Yano
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Publication number: 20040157621Abstract: In a positioning system using the time difference of arrival of signals between a station and a plurality of access points, each of the access points repeatedly measures a signal for calculating a position from the station, while changing any of time, the position of the station, and a frequency in use, and accumulates a plurality of measurement data. A position calculation server determines a given timing on each of a plurality of delay profiles created based on the measurement data obtained from the access points as a reception timing sample for the signal, performs a combination process with respect to the plurality of reception timing samples, and determines one reception timing for each of the access points. The position calculation server calculates the time difference of arrival of signals between the station and the access points based on the reception timings and calculates the coordinates of the position of the station.Type: ApplicationFiled: January 9, 2004Publication date: August 12, 2004Applicant: Hitachi., Ltd.Inventors: Ryota Yamasaki, Atsushi Ogino, Masaaki Shida
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Publication number: 20040046693Abstract: A method, system, and apparatus are provided for detecting a position of a terminal in a network accurately without a GPS receiver. In one example, a method for locating a position of a terminal includes calculating a position of a base station; detecting a clock time difference between the base station and another base station; measuring a reception timing of a signal received by the base station from the terminal; and locating the position of the terminal using at least the position of the base station, the clock time difference, and the reception timing.Type: ApplicationFiled: June 18, 2003Publication date: March 11, 2004Inventors: Atsushi Ogino, Takashi Yano, Katsuhiko Tsunehara, Ryota Yamasaki, Masaaki Shida, Hideya Suzuki, Nobukazu Doi
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Patent number: 6656486Abstract: The object of the present invention is to provide a film composition which is solidified in water of which a painted film is rapidly solidified and also has proper usabilities for use as a manicure. To accomplish the object a film composition of the present invention comprises water insoluble film materials, and a solvent which dissolves the water insoluble film materials and soluble with water, wherein the solvent contains specified alkylene glycol ethers and ketones, and characterized by that the film materials are precipitated from the mixture of the remaining solvent and penetrating water in a painted film of the composition when the painted film is dipped in water.Type: GrantFiled: October 23, 2001Date of Patent: December 2, 2003Assignee: Shiseido Co., Ltd.Inventors: Katsuyuki Kaneko, Ryota Yamasaki, Toshihito Yabu, Isamu Kaneda, Toshio Yanaki, Yoshikazu Soyama
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Publication number: 20030161801Abstract: A stick-type solid water-in-oil type emulsion cosmetic composition having an excellent stability, having a refreshing feeling and freshness after finish when coated on the skin and particularly giving a soft feeling of use when coated, which contains (a) 0.5 to 40.0% by weight of a hydrogenated jojoba oil, (b) 0.1 to 10.0% by weight of a surfactant composed of polyoxyalkylene-modified silicone or alkyl- and polyoxyalkylene-modified silicone and (c) 5.0 to 50.0% by weight of water.Type: ApplicationFiled: December 16, 2002Publication date: August 28, 2003Applicant: SHISEIDO COMPANY, LTD.Inventors: Ryota Yamasaki, Akihito Yokotsuka, Yukiko Kazama
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Publication number: 20030095934Abstract: The object of the present invention is to provide a film composition which is solidified in water of which a painted film is rapidly solidified and also has proper usabilities for use as a manicure.Type: ApplicationFiled: October 23, 2001Publication date: May 22, 2003Inventors: Katsuyuki Kaneko, Ryota Yamasaki, Toshihito Yabu, Isamu Kaneda, Toshio Yanaki, Yoshikazu Soyama