Patents by Inventor Masayuki TAKEKAWA

Masayuki TAKEKAWA 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).

  • Patent number: 9049726
    Abstract: A network management unit included in a base station of WRAN, and a heterogeneous-systems coexistence function unit included in a relay station perform communications by taking advantage of the wireless line of WRAN. In this way, the network management unit and the heterogeneous-systems coexistence function unit make the determination and management of a frequency channel to be utilized by WLAN. Concretely, the QP (Quiet Period) of WRAN and that of WLAN are synchronized with each other with respect to the above-described frequency channel. During the synchronized QPs, WRAN and WLAN make the absence confirmation of a primary user.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: June 2, 2015
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Keigo Hasegawa, Masayuki Takekawa, Keat Beng Toh, Kei Yanagisawa
  • Patent number: 8971277
    Abstract: In a wireless communication system for performing wireless communication using a white space, a receiving station includes an interference suppression processing part which performs processing to reduce interference which is received by the signal transmitted from a transmitting station at a frequency of the white space, a receiving quality estimation part which estimates communication quality of the communication using the frequency of the white space based on the signal processed by the interference suppression processing part, and a receiving quality informing part which transmits to the transmitting station the communication quality information estimated by the receiving quality estimation part.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: March 3, 2015
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Masayuki Takekawa, Keigo Hasegawa, Seishi Sasaki, Keat Beng Toh
  • Publication number: 20140112215
    Abstract: A technique for enabling utilization of a one-way link in wireless communication systems of the type using whitespaces is disclosed. A wireless communication system (1) is arranged to include a transmitting station (10) which transmits data by wireless communication and receiving stations (21-22) which receive data as sent thereto, for performing wireless communication by using a whitespace. The receiving station (21, 22) detects data receivability at a specific frequency and sends communication quality information which is a detection result thereof to the transmitting station (10). The transmitting station (10) holds this communication quality information. Then, upon startup of data reception by wireless communication, the receiving station (21, 22) sends to the transmitting station (10) a packet indicating required quality which is a condition for the data reception.
    Type: Application
    Filed: August 6, 2012
    Publication date: April 24, 2014
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Keigo Hasegawa, Masayuki Takekawa, Keat Beng Toh
  • Publication number: 20130235771
    Abstract: A network management unit included in a base station of WRAN, and a heterogeneous-systems coexistence function unit included in a relay station perform communications by taking advantage of the wireless line of WRAN. In this way, the network management unit and the heterogeneous-systems coexistence function unit make the determination and management of a frequency channel to be utilized by WLAN. Concretely, the QP (Quiet Period) of WRAN and that of WLAN are synchronized with each other with respect to the above-described frequency channel. During the synchronized QPs, WRAN and WLAN make the absence confirmation of a primary user.
    Type: Application
    Filed: February 14, 2013
    Publication date: September 12, 2013
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Keigo HASEGAWA, Masayuki TAKEKAWA, Keat Beng TOH, Kei YANAGISAWA