Patents by Inventor Tsuyoshi Tamaki

Tsuyoshi Tamaki 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).

  • Publication number: 20050015285
    Abstract: An invention for a system and method of delivering contents to a user terminal from a contents delivery server is provided. In one example, the method includes determining reservation information, determining accessibility to the contents delivery server, sending a delivery request to the contents delivery server according to the reservation information, and receiving contents from the contents delivery server.
    Type: Application
    Filed: August 11, 2003
    Publication date: January 20, 2005
    Inventor: Tsuyoshi Tamaki
  • Publication number: 20040171402
    Abstract: A signal pair interference power ratio of the received signal at a user terminal is obtained and this ratio is then compared with the signal pair interference power ratio required for correct demodulation. Accordingly, the user terminals can be classified into those in the non-interference domain and those in the interference domain. A plurality of access points make the simultaneous communications to the user terminals in the non-interference domain and also make the communications on the time-division basis to the user terminals in the interference domain.
    Type: Application
    Filed: August 18, 2003
    Publication date: September 2, 2004
    Inventors: Tsuyoshi Tamaki, Satoshi Tamaki
  • Patent number: 6675007
    Abstract: A charging system for use in a network composed of wireless terminals with a repeater function. As each terminal with a repeater function receives a communication session start request from a user terminal, it searches for a destination user terminal; when it finds the destination user terminal, it transfers the signal sent from the requesting user terminal to the destination user terminal without the mediation of base stations. The information about the amount of data thus transferred or communication time for transferring data is sent to the charging system which is under the control of the communications service provider concerned.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: January 6, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Tsuyoshi Tamaki, Masaaki Shida, Tomoaki Ishifuji, Nobukazu Doi, Kazuko Hamaguchi
  • Publication number: 20030236103
    Abstract: A system and method are provided for wireless communication. In one example, a wireless communication system that enhances total system throughput is provided. The system performs parallel data transmission from a plurality of access points to a plurality of user terminals. On terminals with power control function, their transmit power can be set to minimize interference. The wireless communication system comprises a management server which performs centralized management of time of access-point-to-terminal packet transmission, access points, and user terminals that perform data transmission, according to transmission time control information from the management server. Transmit queues for measuring downlink traffic and receive queues for measuring uplink traffic are provided on the access points or the management server. The system determines uplink and downlink periods from the transmit and receive queue lengths.
    Type: Application
    Filed: June 2, 2003
    Publication date: December 25, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Tsuyoshi Tamaki, Takashi Yano, Takaki Uta, Tomoaki Ishifuji
  • Publication number: 20030124976
    Abstract: A communication system having an excellent communication path capacity characteristic even in an insight transmission environment in which a transmitter and a receiver can see each other directly in an MIMO communication system and a wireless communication device for the communication system, including: a wireless device having a transmitter for distributing transmission data including encoded data and a training signal to a plurality of antennas, and transmitting the data as radio signals from the plurality of antennas at a predetermined timing; a plurality of wireless devices having repeaters each for receiving the radio signal, storing the radio signal into a buffer so that the radio signal is delayed by predetermined time, and transmitting the radio signal delayed; and a wireless device having a receiver for receiving the radio signals from the plurality of second wireless devices by a plurality of antennas and demodulating the encoded data by using the training signal multiplexed on the received radio si
    Type: Application
    Filed: July 11, 2002
    Publication date: July 3, 2003
    Inventors: Tsuyoshi Tamaki, Katsumi Sakai, Takashi Yano
  • Publication number: 20030054796
    Abstract: A charging system for use in a network composed of wireless terminals with a repeater function. As each terminal with a repeater function receives a communication session start request from a user terminal, it searches for a destination user terminal; when it finds the destination user terminal, it transfers the signal sent from the requesting user terminal to the destination user terminal without the mediation of base stations. The information about the amount of data thus transferred or communication time for transferring data is sent to the charging system which is under the control of the communications service provider concerned.
    Type: Application
    Filed: May 30, 2002
    Publication date: March 20, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Tsuyoshi Tamaki, Masaaki Shida, Tomoaki Ishifuji, Nobukazu Doi, Kazuko Hamaguchi
  • Publication number: 20030054795
    Abstract: A charging system for use in a network composed of wireless terminals with a repeater function. As each terminal with a repeater function receives a communication session start request from a user terminal, it searches for a destination user terminal; when it finds the destination user terminal, it transfers the signal sent from the requesting user terminal to the destination user terminal without the mediation of base stations. The information about the amount of data thus transferred or communication time for transferring data is sent to the charging system which is under the control of the communications service provider concerned.
    Type: Application
    Filed: February 4, 2002
    Publication date: March 20, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Tsuyoshi Tamaki, Masaaki Shida, Tomoaki Ishifuji, Nobukazu Doi, Kazuko Hamaguchi
  • Publication number: 20030014712
    Abstract: To provide a turbo decoder reducing power consumption by reducing an operational processing amount while ensuring sufficient error correction capability, there is provided a constitution including an input signal memory for storing turbo-coded received data, a decoder for executing SOVA decoding, a decoded result memory for storing a decoded result, a control block for executing repeated decoding, a memory stored with an interleave pattern, and judging means for judging reliability of a decoded result and the reliability of the decoded result is judged based on a soft decision value outputted from the SOVA decoder and when desired reliability is satisfied by the judgment result, the repeated decoding is finished.
    Type: Application
    Filed: August 17, 2001
    Publication date: January 16, 2003
    Inventors: Takashi Yano, Tsuyoshi Tamaki