Patents by Inventor Ren Sakata

Ren Sakata 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: 11134412
    Abstract: A wireless communication device includes a memory and a wireless interface and processing circuitry. The memory configured to store data to be transmitted and received. The wireless interface configured to transmit and receive a wireless signal. The processing circuitry coupled to the memory and configured to receive a message from another wireless device, including destination information and acknowledgement information, via the wireless interface, set, in a first period being a period in which the message from a child node which transmits the message upward while setting the child node itself as a destination is received, the acknowledgement information with respect to data received from the child node, process the message including the destination information and the acknowledgement information, and transmit a message including the set acknowledgement information via the wireless interface to another wireless device.
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: September 28, 2021
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroki Kudo, Suh Wuk Kim, Sakie Nagakubo, Ren Sakata
  • Patent number: 10841832
    Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: November 17, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Sakie Nagakubo, Ren Sakata, Hiroki Kudo
  • Patent number: 10779218
    Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: September 15, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ren Sakata, Hiroki Kudo, Sakie Nagakubo, Suh Wuk Kim
  • Publication number: 20200187079
    Abstract: According to an embodiment, a wireless communication device includes a memory and one or more hardware processors coupled to the memory. The one or more hardware processors are configured to function as a communication control unit and a determination unit. The communication control unit transmits and receives data to and from a first wireless communication device. The determination unit calculates transmission and reception information based on a transmission and reception result of the data, and variation of received signal intensity of the data, and determines whether to maintain connection to the first wireless device based on the transmission and reception information and the variation. The communication control unit controls communication according to a determination result of the determination unit.
    Type: Application
    Filed: August 27, 2019
    Publication date: June 11, 2020
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Sakie NAGAKUBO, Ren SAKATA, Hiroki KUDO
  • Publication number: 20200084690
    Abstract: According to one embodiment, a data management device collecting data from a plurality of wireless nodes in a wireless multihop network is provided. The data management device includes a transceiver configured to transmit and receive a radio signal; and controlling circuitry. The controlling circuitry determines a first range of numbers of hops from the data management device for execution of route control in the wireless multihop network, performs the route control for the first range of numbers of hops and does not perform the route control beyond the first range of numbers of hops from the data management device.
    Type: Application
    Filed: March 11, 2019
    Publication date: March 12, 2020
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ren SAKATA, Hiroki KUDO, Sakie NAGAKUBO, Suh Wuk KIM
  • Publication number: 20200077297
    Abstract: A wireless communication device includes a memory and a wireless interface and processing circuitry. The memory configured to store data to be transmitted and received. The wireless interface configured to transmit and receive a wireless signal. The processing circuitry coupled to the memory and configured to receive a message from another wireless device, including destination information and acknowledgement information, via the wireless interface, set, in a first period being a period in which the message from a child node which transmits the message upward while setting the child node itself as a destination is received, the acknowledgement information with respect to data received from the child node, process the message including the destination information and the acknowledgement information, and transmit a message including the set acknowledgement information via the wireless interface to another wireless device.
    Type: Application
    Filed: February 26, 2019
    Publication date: March 5, 2020
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroki KUDO, Suh Wuk Kim, Sakie Nagakubo, Ren Sakata
  • Publication number: 20200068429
    Abstract: According to one embodiment, a wireless communication device connected with a multi-hop network includes one or more processors. The processors communicate with a first parent node of the wireless communication device and with a child node of the wireless communication device. The processors transmit an instruction to restrict communication to the child node or do not receive data from the child node when receiving an abnormality notification indicating an abnormality from the first parent node.
    Type: Application
    Filed: February 21, 2019
    Publication date: February 27, 2020
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Sakie NAGAKUBO, Ren SAKATA, Hiroki KUDO
  • Patent number: 10506430
    Abstract: According to an embodiment, a communication apparatus includes a receiver, a first beacon processor, a second beacon processor, and an authentication processor. The receiver receives a first beacon transmitted over a wireless network while being protected by a first common key and a second beacon transmitted over the wireless network while not being protected by the first common key. The first beacon processor accesses the wireless network using information contained in the first beacon when the first common key is provided. The second beacon processor accesses the wireless network using information contained in the second beacon when the first common key is not provided. The authentication processor performs connection authentication to the wireless network using information contained in the second beacon and acquires the first common key.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: December 10, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Oba, Ren Sakata, Hiroki Kudo, Yusuke Doi
  • Patent number: 10439749
    Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: October 8, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuji Tohzaka, Ren Sakata, Sakie Nagakubo, Hiroki Kudo
  • Patent number: 10334501
    Abstract: In a first subframe determined from a first number of hops up to a concentrator and being among a plurality of subframes included in a first frame period, a first wireless communication apparatus transmits first data, a second wireless communication apparatus transmits second data, and a third wireless communication apparatus receives the second data. In a second subframe determined from a second number of hops different from the first number of hops up to the concentrator and not corresponding to the first subframe among a plurality of subframes included in a second frame period following after the first frame period, the third wireless communication apparatus transmits the second data, and the third wireless communication apparatus does not transmit the second data in the first frame period.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: June 25, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuji Tohzaka, Hiroki Kudo, Ren Sakata
  • Patent number: 10306629
    Abstract: According to an embodiment, a wireless communication device is one of a plurality of wireless communication devices constituting a wireless communication system. The device includes one or more processors configured to have a network topology construction mode and a time-division wireless communication mode. A first cycle as a communication cycle in the network topology construction mode is shorter than a second cycle as a communication cycle in the time-division wireless communication mode.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: May 28, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Sakie Nagakubo, Ren Sakata
  • Patent number: 10278233
    Abstract: According to one embodiment, a communication apparatus includes a radio interface unit that sends a data message to a receiver and extracts, when a message sent by the receiver via unicast with an optimized transmission rate is received, rate information indicating the optimized transmission rate of the receiver from the received message, a message processor that generates the data message, in which a multicast identifier indicating a multicast group is a destination, and outputs the data message to the radio interface unit, and a selector that selects, according to the rate information, a data message transmission rate to send the data message.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: April 30, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Yujen Lai, Yosuke Bando, Kenichi Maeda, Masahiro Ishiyama, Ren Sakata, Hiroki Kudo, Takeshi Sakoda
  • Patent number: 10271327
    Abstract: A wireless communication device according to an embodiment is one of a plurality of wireless communication devices in a multihop wireless communication system to transmit and receive information with each other. The wireless communication device has: a transmitter configured to transmit information in an m-th slot (m is an integer equal to or more than 1 and equal to or less than M, M is an integer equal to or more than 2) in a first slot group in N slot groups (N is an integer equal to or more than 2) in a frame, respective one of the slot groups including M slots, and a controller configured to control the transmitter to receive a connection request in an m-th slot in a second slot group in the N slot groups from a wireless communication device not included in the plurality of wireless communication devices.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: April 23, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ren Sakata, Hiroki Kudo, Fumiaki Kanayama, Yuji Tohzaka, Sakie Nagakubo, Suhwuk Kim
  • Patent number: 10243771
    Abstract: An orthogonal frequency division multiplexing (OFDM) signal transmission apparatus which transmits OFDM signals by using a plurality of transmission antennas includes a subcarrier setting device which sets signals for subcarriers so as to use some of the subcarriers of the OFDM signals as pilot subcarriers to transmit pilot signals and use the remaining subcarriers as data subcarriers to transmit data signals, the subcarrier setting device changing polarities of signals for the pilot subcarriers for each transmission antenna.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: March 26, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tsuguhide Aoki, Ichiro Seto, Daisuke Takeda, Takehiko Toyoda, Ren Sakata
  • Patent number: 10193661
    Abstract: According to one embodiment of the present invention, there is provided a communication device includes: processing circuitry configured to generate first bitmap data indicating a calculated value of a function based on identifiers of other first communication devices; and a communicator configured to transmit a first message including the first bitmap data.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 29, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Fumiaki Kanayama, Yusuke Doi, Hiroki Kudo, Yuji Tohzaka, Ren Sakata
  • Patent number: 10103973
    Abstract: A communication device according to an embodiment is included in a multi-hop network. The communication device includes a holder, a storage, a switcher, and a controller. The holder holds communication data. The storage stores path information including an identifier that identifies a communication path and destination information that indicates a destination of communication data on the communication path. The switcher switches a communication path used to transmit communication data on the basis of the path information stored in the storage. The controller transmits communication data to a destination of a communication path switched by the switcher.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: October 16, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takaomi Murakami, Yoshihiro Oba, Ren Sakata, Hiroki Kudo, Jumpei Ogawa
  • Publication number: 20180278353
    Abstract: According to an embodiment, a wireless communication device performs time-division communication and includes a storage and one or more processors. The storage is configured to store transmission data to be sent in a first period of time. The one or more processors are configured to perform a transmission process of sending the transmission data in a first frame at start of a plurality of frames included in the first period of time, or perform a transmission process of sending a pieces of divided the transmission data in a plurality of successive frames beginning from the first frame and included in the first period of time. After the transmission process, the wireless communication device switches to sleep mode in one or more frames of the first period of time.
    Type: Application
    Filed: August 29, 2017
    Publication date: September 27, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yuji TOHZAKA, Ren SAKATA, Sakie NAGAKUBO, Hiroki KUDO
  • Publication number: 20180270733
    Abstract: A wireless communication system includes a concentrator and a plurality of wireless communication apparatuses including a first wireless communication apparatus having a first number of hops up to the concentrator, a second wireless communication apparatus having a second number of hops different from the first number of hops up to the concentrator, and a third wireless communication apparatus having a third number of hops different from the first number of hops and the second number of hops up to the concentrator. In a first subframe among a plurality of subframes included in a first frame period, the first wireless communication apparatus transmits first data, the second wireless communication apparatus transmits second data, and the third wireless communication apparatus receives the second data.
    Type: Application
    Filed: August 31, 2017
    Publication date: September 20, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yuji TOHZAKA, Hiroki KUDO, Ren SAKATA
  • Patent number: 10080187
    Abstract: A wireless communication apparatus according to an embodiment includes a transceiver and a transmission slot determiner. The transceiver transmits/receives information. The transmission slot determiner determines a transmission slot in which the transceiver transmits information, from a frame time-divided into a plurality of slots, based on the rank value of self node corresponding to the number of hops to a root node. A plurality of slot groups including a plurality of continuous slots is set in the frame. The slot groups are assigned different rank values. The transmission slot determiner selects a slot group to which the rank value of self node is assigned, and determines a transmission slot from among the slots included in the selected slot group.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: September 18, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ren Sakata, Hiroki Kudo, Jumpei Ogawa
  • Publication number: 20180263034
    Abstract: According to an embodiment, a wireless communication device is one of a plurality of wireless communication devices constituting a wireless communication system. The device includes one or more processors configured to have a network topology construction mode and a time-division wireless communication mode. A first cycle as a communication cycle in the network topology construction mode is shorter than a second cycle as a communication cycle in the time-division wireless communication mode.
    Type: Application
    Filed: August 4, 2017
    Publication date: September 13, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Sakie NAGAKUBO, Ren SAKATA