Patents by Inventor Tetsu Nakajima

Tetsu Nakajima 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: 10244431
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Grant
    Filed: February 12, 2018
    Date of Patent: March 26, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Publication number: 20180176821
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Application
    Filed: February 12, 2018
    Publication date: June 21, 2018
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Patent number: 10004069
    Abstract: There is provided a wireless terminal including: a frame allocating unit performing an allocation process on a frame to be transmitted to another wireless terminal; a first communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a first channel or a first mode; a second communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a second channel or a second mode, wherein the allocating unit allocates the frame to one of the first and second communication units; when changing the transmission source of the frame from the one to the other communication unit, a change notification frame including a transmission starting sequence number is transmitted to the another wireless terminal; and the frame allocating unit switches the allocation destination of the frame from the one to the other.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: June 19, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko Adachi, Tetsu Nakajima
  • Patent number: 9930572
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: March 27, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Publication number: 20170163514
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Application
    Filed: February 23, 2017
    Publication date: June 8, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu NAKAJIMA, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Patent number: 9648590
    Abstract: A communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: May 9, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Kiyoshi Toshimitsu, Tatsuma Hirano, Yoriko Utsunomiya
  • Patent number: 9622112
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: April 11, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Publication number: 20150319645
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Application
    Filed: July 14, 2015
    Publication date: November 5, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu NAKAJIMA, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Publication number: 20150264685
    Abstract: There is provided a wireless terminal including: a frame allocating unit performing an allocation process on a frame to be transmitted to another wireless terminal; a first communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a first channel or a first mode; a second communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a second channel or a second mode, wherein the allocating unit allocates the frame to one of the first and second communication units; when changing the transmission source of the frame from the one to the other communication unit, a change notification frame including a transmission starting sequence number is transmitted to the another wireless terminal; and the frame allocating unit switches the allocation destination of the frame from the one to the other.
    Type: Application
    Filed: May 19, 2015
    Publication date: September 17, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko ADACHI, Tetsu NAKAJIMA
  • Patent number: 9094863
    Abstract: A radio communication method stores a plurality MAC frames for each of a plurality of destinations. The method decides the longest transmission time of transmission times needed to transmit the plurality of MAC frames to each of the plurality of destinations within a fixed period. The method generates a plurality of physical frames for the plurality of destinations to transmit them at the same time by connecting the plurality of MAC frames and adding additional information to each connected MAC frame so as to be a frame length equivalent to a transmission time equal to the longest transmission time.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: July 28, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsu Nakajima, Tomoko Adachi, Yoriko Utsunomiya, Tomoya Tandai, Masahiro Takagi
  • Patent number: 9042313
    Abstract: There is provided a wireless terminal including: a frame allocating unit performing an allocation process on a frame to be transmitted to another wireless terminal; a first communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a first channel or a first mode; a second communication unit assigning a sequence number to the allocated frame and transmitting the frame to the another wireless terminal through a second channel or a second mode, wherein the allocating unit allocates the frame to one of the first and second communication units; when changing the transmission source of the frame from the one to the other communication unit, a change notification frame including a transmission starting sequence number is transmitted to the another wireless terminal; and the frame allocating unit switches the allocation destination of the frame from the one to the other.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: May 26, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko Adachi, Tetsu Nakajima
  • Patent number: 8786414
    Abstract: A communication device includes a first receiver, a second receiver, a communication module, and a controller. The first receiver receives an operation signal from a remote controller. The second receiver receives a radio signal with a specific frequency. A power consumption of the second receiver is less than that of the first receiver. The communication module is capable of transmitting the operation signal to a first communication device. The controller controls power supply to the first receiver and the communication module and starts power supply to the first receiver and the communication module if the second receiver receives the radio signal. The communication module turns to a standby state if the first receiver does not receive the operation signal after start of power supply to the first receiver.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: July 22, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsu Nakajima, Tomoko Adachi, Kiyoshi Toshimitsu
  • Publication number: 20130343254
    Abstract: A communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.
    Type: Application
    Filed: August 29, 2013
    Publication date: December 26, 2013
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsu NAKAJIMA, Tomoko ADACHI, Kiyoshi TOSHIMITSU, Tatsuma HIRANO, Yoriko UTSUNOMIYA
  • Patent number: 8548392
    Abstract: A communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: October 1, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsu Nakajima, Tomoko Adachi, Kiyoshi Toshimitsu, Tatsuma Hirano, Yoriko Utsunomiya
  • Patent number: 8503339
    Abstract: A wireless communication apparatus performs bi-directional communication with an initiator. The apparatus is allocated an allocation period for data transmission from the initiator. The apparatus includes means for generating a first physical frame including an acknowledgement frame with respect to data received from the initiator, and generating a second physical frame in which a plurality of transmission data frames addressed to the initiator are aggregated. The apparatus also includes means for transmitting the first physical frame at a first transmission rate and the second physical frame at a second transmission rate, during the allocation period.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: August 6, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsu Nakajima, Tomoko Adachi, Masahiro Takagi, Tomoya Tandai, Yoriko Utsunomiya, Toshihisa Nabetani
  • Publication number: 20120315962
    Abstract: A communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.
    Type: Application
    Filed: August 17, 2012
    Publication date: December 13, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsu NAKAJIMA, Tomoko Adachi, Kiyoshi Toshimitsu, Tatsuma Hirano, Yoriko Utsunomiya
  • Patent number: 8289987
    Abstract: A wireless communication system includes first and second wireless terminals capable of performing transmission by at least one of a first transmission scheme and a second transmission scheme. The first wireless terminal performs transmission of a first frame to the second wireless terminal by using the second transmission scheme. The second wireless terminal communicates with the first wireless terminal to notify the first wireless terminal of information associated with a status of the reception of the first frame transmitted from the first wireless terminal by using the first transmission scheme.
    Type: Grant
    Filed: September 24, 2008
    Date of Patent: October 16, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tomoko Adachi, Masahiro Takagi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya, Yasuyuki Nishibayashi, Daisuke Takeda
  • Patent number: 8284753
    Abstract: A wireless communication apparatus including a main queue to store MAC frames, a plurality of subqueues related to the main queue and used to control retransmission of the MAC frame, each of the subqueues having different priority for transmission of the MAC frame, respectively, an extracting device configured to extract the MAC frame from the main queue on the basis of a destination and the priority, and distribute the extracted MAC frame to one of the plurality of subqueues for each priority, and an aggregating device configured to extract MAC frames from the plurality of subqueues to form a MAC super frame.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: October 9, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tomoya Tandai, Tetsu Nakajima, Yoriko Utsunomiya
  • Patent number: 8274992
    Abstract: A physical frame is generated and transmitted to a destination terminal. In this physical frame, one of a data frame, an acknowledgement frame, and an acknowledgement request frame, and a transmission permission frame which is used in place of a normal Ack frame associated with a delayed Block Ack, and permits the destination terminal to perform piggyback transmission, are aggregated.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: September 25, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuyuki Nishibayashi, Masahiro Takagi, Tomoko Adachi, Tetsu Nakajima, Tomoya Tandai, Yoriko Utsunomiya
  • Patent number: 8271059
    Abstract: According to one embodiment, a communication device includes a receiver, a transmitter and an interruption module. The receiver receives an allocation signal indicating a first period usable by the communication device and a second period usable by a plurality of communication devices including the communication device. The transmitter transmits a transmission signal in the first period. If the transmission of the transmission signal is completed within the first period, the interruption module interrupts at least a part of power supply to the receiver in the second period. If the transmission of the transmission signal is not completed within the first period and directivity of radio waves used by a second communication device includes a direction of the communication device in a communication period allocated before the second period, the transmitter transmits the transmission signal in the second period.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: September 18, 2012
    Assignee: Kabushiki Kaisha TOSHIBA
    Inventors: Tetsu Nakajima, Tomoko Adachi, Kiyoshi Toshimitsu, Tatsuma Hirano, Yoriko Utsunomiya