Patents by Inventor Toshihisa Nabetani

Toshihisa Nabetani 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: 20190222268
    Abstract: According to one embodiment, a wireless communication device includes a receiver configured to receive a plurality of first frames which are transmitted by multiplexing; and a transmitter configured to transmit a second frame containing check results indicating whether the plurality of first frames are successfully received and first information specifying at least one wireless communication device. The receiver is configured to receive a plurality of third frames transmitted by multiplexing in response to the second frame.
    Type: Application
    Filed: March 28, 2019
    Publication date: July 18, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa NABETANI, Ryoko MATSUO, Tomoko ADACHI, Tsuguhide AOKI
  • Publication number: 20190182362
    Abstract: According to one embodiment, a wireless communication device includes: a receiver configured to receive a plurality of first frames transmitted by spatial multiplexing; and a transmitter configured to transmit a second frame containing check results indicating whether the first frames are successfully received and first information specifying at least one communication device. The receiver is configured to receive a plurality of third frames transmitted by spatial multiplexing from a communication device having transmitted the first frame the check result of which represents failure and the communication device specified in the first information.
    Type: Application
    Filed: February 21, 2019
    Publication date: June 13, 2019
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Toshihisa NABETANI, Ryoko MATSUO, Tomoko ADACHI, Tsuguhige AOKI
  • Patent number: 10321481
    Abstract: According to one embodiment, a wireless communication device includes: controlling circuitry configured to determine parameter information on a backoff time of carrier sensing performed according to CSMA/CA (carrier sense multiple access/collision avoidance) on basis of a number of other wireless communication devices which have established connections with the wireless communication device; and a transmitter configured to transmit a first frame which instructs to transmit a response frame according to the parameter information.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: June 11, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa Nabetani, Hiroki Mori
  • Publication number: 20190174488
    Abstract: According to one embodiment, a wireless communication device includes a transmitter configured to transmit a beacon signal including first information to specify a first wireless communication device to be reassigned a slot and a start timing to allow use of a reassigned slot, and transmit, after transmission of the first information, a first signal including second information to specify the reassigned slot the first signal being a signal different from the beacon signal and a receiver configured to receive a signal.
    Type: Application
    Filed: January 17, 2019
    Publication date: June 6, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Toshiyuki Nakanishi, Toshihisa Nabetani, Hirokazu Tanaka
  • Publication number: 20190174544
    Abstract: According to one embodiment, a wireless communication device includes: controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and to determine, when a first frame addressed to another device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs.
    Type: Application
    Filed: February 5, 2019
    Publication date: June 6, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Tomoya Tandai, Toshihisa Nabetani
  • Patent number: 10291299
    Abstract: According to one embodiment, a wireless communication device includes a receiver configured to receive a plurality of first frames which are transmitted by multiplexing; and a transmitter configured to transmit a second frame containing check results indicating whether the plurality of first frames are successfully received and first information specifying at least one wireless communication device. The receiver is configured to receive a plurality of third frames transmitted by multiplexing in response to the second frame.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: May 14, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa Nabetani, Ryoko Matsuo, Tomoko Adachi, Tsuguhide Aoki
  • Patent number: 10257321
    Abstract: According to one embodiment, a wireless communication device includes: a receiver configured to receive a plurality of first frames transmitted by spatial multiplexing; and a transmitter configured to transmit a second frame containing check results indicating whether the first frames are successfully received and first information specifying at least one communication device. The receiver is configured to receive a plurality of third frames transmitted by spatial multiplexing from a communication device having transmitted the first frame the check result of which represents failure and the communication device specified in the first information.
    Type: Grant
    Filed: September 2, 2016
    Date of Patent: April 9, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa Nabetani, Ryoko Matsuo, Tomoko Adachi, Tsuguhide Aoki
  • Patent number: 10257735
    Abstract: According to one embodiment, a wireless communication device includes: a transmitter configured to transmit a first frame, the first frame being a frame for channel estimation; a receiver configured to receive a second frame, the second frame including channel information; and controlling circuitry. The transmitter is configured to transmit a third frame by beamforming based on the channel information. The controlling circuitry is configured to measure a communication quality of a channel based on a response frame to the third frame and control a transmission timing of the first frame based on the communication quality and a transmission rate of the third frame.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: April 9, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventor: Toshihisa Nabetani
  • Patent number: 10244557
    Abstract: According to one embodiment, a wireless communication device includes: controlling circuitry configured to set at least one of: a first transmission prohibition period for a first network to which the wireless communication device belongs; or a second transmission prohibition period for a second network, and to determine, when a first frame addressed to another device is received in a case that the first transmission prohibition period is not set and the second transmission prohibition period is set, a state of a wireless medium based on comparing a reception level of the first frame with a threshold defined corresponding to one of the first network and the second network, to which a sender of the first frame belongs.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: March 26, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Tomoya Tandai, Toshihisa Nabetani
  • Publication number: 20190089515
    Abstract: According to one embodiment, an electronic apparatus includes a receiver configured to receive a first frame in a first frequency band within a first period from a first apparatus; and a transmitter configured to transmit a second frame in the first frequency band within the first period to a second apparatus. A transmission power of the second frame depends on both a reception quality required by the second apparatus to receive the second frame and an amount of interference from the first apparatus to the second apparatus.
    Type: Application
    Filed: March 5, 2018
    Publication date: March 21, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Narendar MADHAVAN, Toshihisa NABETANI, Tsuguhide AOKI
  • Publication number: 20190089519
    Abstract: According to one embodiment, a wireless communication device includes a receiver and a transmitter. The receiver receives a first frame in a predetermined frequency band. The transmitter transmits a second frame in the predetermined frequency band at a same time as receipt of the first frame. The transmitter transmits control information that controls a transmission timing of a third frame that is a response frame to the second frame. The transmitter transmits a fourth frame that is a response frame to the first frame, at a timing according to the control information.
    Type: Application
    Filed: March 1, 2018
    Publication date: March 21, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa NABETANI, Masahiro SEKIYA, Narendar MADHAVAN
  • Patent number: 10231231
    Abstract: One of a plurality of radio terminals that transmit radio signals to a radio base station under a space multiplexing scheme, including a receiving unit that receives an access right request signal with respect to the radio base station from an other radio terminal, a prevention unit that prevents transmission of radio signals when receiving radio signals directed to an other radio terminal, a cancellation unit that cancels the prevention of transmission when receiving an access right assignment signal during the prevention of transmission and a transmitting unit that transmits a data signal to the radio base station according to the assignment signal, wherein radio signals are transmitted to the radio base station simultaneously with the other radio terminals and under the space multiplexing scheme.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: March 12, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Tatsuma Hirano, Toshihisa Nabetani, Tomoko Adachi, Kiyoshi Toshimitsu
  • Patent number: 10231233
    Abstract: According to one embodiment, a wireless communication device includes a transmitter configured to transmit a beacon signal including first information to specify a first wireless communication device to be reassigned a slot and a start timing to allow use of a reassigned slot, and transmit, after transmission of the first information, a first signal including second information to specify the reassigned slot, the first signal being a signal different from the beacon signal and a receiver configured to receive a signal.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: March 12, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Toshiyuki Nakanishi, Toshihisa Nabetani, Hirokazu Tanaka
  • Publication number: 20190068324
    Abstract: According to one embodiment, a wireless communication apparatus includes controlling circuitry and transmitter circuitry. The controlling circuitry is configured to divide data into bit strings by a unit of a first number of bits; add at least one padding bit to one of the bit strings according to a difference between a number of bits of the one of the bit strings and the first number of bits, when the one of the bit strings has a number of bits less than the first number of bits; add error correction codes to the bit strings to generate encoded blocks, wherein each of the error correction codes has a second number of bits; combine the encoded blocks to generate encoded frames; and aggregate the encoded frames to generate a transmission packet. The transmitter circuitry is configured to transmit the transmission packet.
    Type: Application
    Filed: February 22, 2018
    Publication date: February 28, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kentaro TANIGUCHI, Toshihisa NABETANI, Ryota SEKIYA
  • Patent number: 10219285
    Abstract: According to one embodiment, a wireless communication device includes: a receiver configured to receive a first frame from a first terminal and a second frame from a second terminal; and controlling circuitry configured to obtain quality information of a first channel with the first terminal based on the first frame and quality information of a second channel with the second terminal based on the second frame, and determine a transmission rate applied to the first terminal and a transmission rate applied to the second terminal in spatially multiplexed transmission, based on the quality information of the first channel, the quality information of the second channel and interference amount information being indicative of an amount of interference depending on an execution condition of the spatially multiplexed transmission.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: February 26, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihisa Nabetani, Haruka Obata
  • Publication number: 20190058568
    Abstract: According to one embodiment, an electronic apparatus includes controller circuitry, transmitter circuitry, and receiver circuitry. The controller circuitry is configured to judge whether a payload for a first packet comprises retransmission data; set a first PHY header for the first packet, when the payload does not comprise the retransmission data; set a second PHY header for the first packet, when the payload includes the retransmission data, wherein the second PHY header comprises an amount of information larger than an amount of information of the first PHY header; and generate the first packet comprising the payload and either one of the first PHY header or the second PHY header set for the first packet. The transmitter circuitry is configured to transmit the first packet. The receiver circuitry is configured to receive an ACK signal or a NACK signal for the first packet.
    Type: Application
    Filed: February 22, 2018
    Publication date: February 21, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kentaro TANIGUCHI, Toshihisa NABETANI, Ryota SEKIYA
  • Publication number: 20190037570
    Abstract: A wireless communication apparatus which can simultaneously conduct communication on at least two frequency channels is described. The apparatus includes a communication unit which refers to a connection management table to determine a communication system which can be used by a wireless communication terminal using an identifier of the wireless communication terminal, and conducts communication with the wireless communication terminal on a second frequency channel using the communication system, when a request from the wireless communication terminal to change the first frequency channel to the second frequency channel is permitted.
    Type: Application
    Filed: September 17, 2018
    Publication date: January 31, 2019
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko ADACHI, Toshihisa NABETANI, Kiyoshi TOSHIMITSU, Tatsuma HIRANO
  • Patent number: 10187110
    Abstract: According to one embodiment, a wireless communication device includes a receiver and controlling circuitry. The receiver receives a first frame transmitted by a first wireless communication device in a predetermined frequency band. The controlling circuitry performs channel estimation based on the first frame to acquire channel information between the first wireless communication device and the wireless communication device. The receiver receives a second frame transmitted by a second wireless communication device. The controlling circuitry calculates, using the channel information, weight coefficients for a plurality of antennas to suppress reception of a signal from the first wireless communication device.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: January 22, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventor: Toshihisa Nabetani
  • Patent number: 10171148
    Abstract: According to one embodiment, a wireless communication device includes a transmitter configured to multiplex and transmit a plurality of first frames; a receiver configured to receive a plurality of second frames that represent acknowledgement responses to the plurality of first frames and are multiplexed and transmitted; and controlling circuitry. The first information necessary for transmission of the plurality of second frames is set in the plurality of first frames. The controlling circuitry is configured to separate the plurality of second frames based on the first information.
    Type: Grant
    Filed: December 30, 2016
    Date of Patent: January 1, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventor: Toshihisa Nabetani
  • Patent number: 10158397
    Abstract: According to one embodiment, a wireless device includes a receiver configured to receive a first beacon signal via a first channel; and control circuitry. The control circuitry is configured to: analyze the first beacon signal to obtain channel information for specifying a second channel, change an operation channel of the receiver from the first channel to the second channel, and change, in a case of not receiving a second beacon signal via the second channel during a predetermined period of time, the operation channel of the receiver from the second channel to the first channel. The receiver is further configured to receive a third beacon signal via the first channel after the operation channel is changed from the second channel to the first channel.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: December 18, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoko Matsuo, Toshihisa Nabetani, Toshiyuki Nakanishi, Hirokazu Tanaka