Patents by Inventor Kentarou Sawa

Kentarou Sawa 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).

  • Signaling and training for antenna selection in OFDMA networks
    Patent number: 8009580
    Abstract: A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: August 30, 2011
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zhifeng Tao, Andreas F. Molisch, Philip V. Orlik, Jinyun Zhang, Shigeru Uchida, Kentarou Sawa
  • Method and system for enabling HARQ operations on channels between stations in wireless communication networks
    Patent number: 7630355
    Abstract: A method and system enables and improves performance of hybrid automatic repeat request (HARQ) operations on channels between stations of an orthogonal frequency division multiple access (OFDMA) wireless communication network. There, the number of parallel HARQ channels is increased adaptively, and one connection identifier is used to unambiguously identify a set of MAC protocol data units (MPDUs) communicated over parallel HARQ channels. A sequence number is used to avoid out-of-order MPDU delivery when MPDUs are transmitted over parallel HARQ channels. The MPDUs can be concatenated or encapsulated. The maximum number of the parallel HARQ channels can be increased to 256, and can be negotiated when a station enters or re-enters the network.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: December 8, 2009
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Zhifeng Tao, Toshiyuki Kuze, Shigeru Uchida, Kentarou Sawa, Koon Hoo Teo, Jinyun Zhang
  • Signaling and Training for Antenna Selection in OFDMA Networks
    Publication number: 20090016372
    Abstract: A method selects antennas in an OFDMA wireless network including a base station and a mobile station. The mobile station measures a channel state of a downlink in a downlink subframe using different subsets of available antennas, and selects a subset of receive antennas for downlink reception based on the channel states between the base station and the different subsets of antennas at the mobile station. The base station measures the channel state in an uplink using an uplink subframe received in the base station from the mobile station, and selects a subset of transmit antennas for mobile station's uplink transmission based on the channel states between the base station and different subset of antennas at the mobile station.
    Type: Application
    Filed: May 8, 2008
    Publication date: January 15, 2009
    Inventors: Zhifeng Tao, Andreas F. Molisch, Philip V. Orlik, Jinyun Zhang, Shigeru Uchida, Kentarou Sawa
  • Method and System for Enabling HARQ Operations on Channels between Stations in Wireless Communication Networks
    Publication number: 20080165670
    Abstract: A method and system enables and improves performance of hybrid automatic repeat request (HARQ) operations on channels between stations of an orthogonal frequency division multiple access (OFDMA) wireless communication network. There, the number of parallel HARQ channels is increased adaptively, and one connection identifier is used to unambiguously identify a set of MAC protocol data units (MPDUs) communicated over parallel HARQ channels. A sequence number is used to avoid out-of-order MPDU delivery when MPDUs are transmitted over parallel HARQ channels. The MPDUs can be concatenated or encapsulated. The maximum number of the parallel HARQ channels can be increased to 256, and can be negotiated when a station enters or re-enters the network.
    Type: Application
    Filed: January 5, 2007
    Publication date: July 10, 2008
    Inventors: Zhifeng Tao, Toshiyuki Kuze, Shigeru Uchida, Kentarou Sawa, Koon Hoo Teo, Jinyun Zhang