1
Tsunehara Katsuhiko, Yano Takashi, Doi Nobukazu, Uta Takaki, Hasegawa Keiji: Transmission power control method for a cdma communication system. Hitachi, June 10, 1998: EP0847147-A2 (44 worldwide citation)

An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station (203) measures the received level of data transmitted from each mobile terminal (204) at each channel, and generates a transmission power control si ...


2
Kuwahara Mikio, Doi Nobukazu, Suzuki Toshiro, Ishida Yuji, Inoue Takashi, Niida Sumaru: Radio base station with array antenna and transmission calibration. Hitachi, Kdd, March 21, 2001: EP1085684-A2 (39 worldwide citation)

Phase and amplitude deviations, which are generated, for example, by cables connecting an array antenna of a CDMA base station and the base station, are calibrated in the baseband. The base station comprises: an antenna apparatus 1; couplers 2; an RF unit 3 that converts a receive signal to a baseba ...


3
Doi Nobukazu, Yano Takashi: Mobile radio communication system with traffic distribution control by varying the cell sizes.. Hitachi, September 14, 1994: EP0615395-A1 (37 worldwide citation)

A cellular mobile communication system includes a plurality of base stations connected to a relay station (803), each base station having adaptability for coping with change in traffic volume within a relevant cell covered thereby. The relay station issues a command for lowering the power gain for t ...


4
Kuwabara Mikio, Doi Nobukazu: Radio terminal position measuring method and terminal unit using the method and terminal position management office device. Hitachi, June 22, 2001: JP2001-166026 (29 worldwide citation)

PROBLEM TO BE SOLVED: To prevent the lowering of S/I for a target base station when there is a terminal close to a base station other than the target base station.SOLUTION: A signal replica from a near base station is prepared, and the replica is deducted from a received signal. A signal of the targ ...


5
Ariyoshi Masayuki, Doi Nobukazu, Shiga Tesshin, Ohta Yoshito: Synchronisation of the reverse link in a cdma communications system. Hitachi, Hitachi Denki Kabushiki Kaisha, January 14, 1998: EP0818892-A2 (18 worldwide citation)

In CDMA communications, a base station detects a difference between a reference phase of a spreading code and a phase of a received signal of each terminal station, and feeds a phase jump signal PJ-i representative of the phase difference back to each terminal station. After timing acquisition, the ...


6
Ogino Atsushi, Yano Takahashi, Tsunehara Katsuhiko, Yamasaki Ryota, Shida Masaaki, Suzuki Hideya, Doi Nobukazu: Method, system and apparatus for detecting a position of a terminal in a network. Hitachi, March 10, 2004: EP1396730-A1 (18 worldwide citation)

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 (100) includes calculating a position of a base station (110-120); detecting a clock time difference betw ...


7
Kuwahara Mikio, Doi Nobukazu: Code division multiple access communication method using dynamic code assignment, and a base station performing the method. Hitachi, December 27, 2000: EP1063791-A2 (14 worldwide citation)

It is desired to carry out CDMA communication using an optimum spread code for minimizing inter-channel interference according to communication conditions. For this purpose, under condition that a communication area covered by a base station is variable, notification of spread code reassignment is i ...


8
Ogino Atsushi, Yano Takashi, Tsunehara Katsuhiko, Yamazaki Ryota, Shida Masaaki, Suzuki Hideya, Doi Nobukazu: Wireless system, its server, and its base station. Hitachi, April 2, 2004: JP2004-101254 (14 worldwide citation)

PROBLEM TO BE SOLVED: To detect a position with high accuracy without provision of an additional GPS receiver in a terminal.SOLUTION: In the wireless LAN system, the respective base stations 110, 111, 112 detect mutual clock lag by mutual radio communication, the respective base stations 110, 111, 1 ...


9
Tsunehara Katsuhiko, Doi Nobukazu, Kuwahara Mikio, Ishifuji Tomoaki: A method for measuring distance and position using spread spectrum signals, and an equipment using the method. Hitachi, January 2, 2002: EP1167993-A2 (13 worldwide citation)

Under a multi-path environment, receive timing for the incoming wave of the minimum propagation delay time cannot be accurately measured using the prior art. By using the delay profile (202) created by delay profile creating section (102) and the first threshold value (330) received from the first t ...


10
Suzuki Hideya, Doi Nobukazu, Ishifuji Tomoaki: Digital communication system with multiple application priorities. Hitachi, January 16, 2002: EP1172766-A1 (12 worldwide citation)

A time slot for a connection request sent from a mobile station (102) includes a mobile station ID and an application discrimination word of the application for which the mobile station requests the connection. By referring to a database, a base station 104 assigns a message data channel MDC prefere ...