Patents by Inventor Masashi Iwabuchi

Masashi Iwabuchi 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: 20250039693
    Abstract: The following processing is performed in the learning phase. The base station device transmits a control signal toward the relay device. The relay device dynamically selects a phase weight that determines the beam direction of the reflected wave according to the set value. A channel state of the CH2 is estimated from a low-frequency CH2 reference signal that has arrived at the base station device from the terminal device. The communication quality of the CH1 is measured from the high-frequency CH1 reference signal that has arrived at the base station device from the terminal device. A learning model is generated by learning the set value, the channel state, and the communication quality. In the estimation phase, the latest channel state acquired by the CH2 is applied to the learning model, and an optimum set value predicted to maximize the communication quality under the latest state is estimated.
    Type: Application
    Filed: December 13, 2021
    Publication date: January 30, 2025
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Riku OMIYA, Tatsuhiko IWAKUNI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240429976
    Abstract: A base station according to an embodiment is a base station that performs wireless communication with a terminal using a directional antenna within a predetermined area, the base station including: acquisition circuitry configured to acquire data from a database that holds data indicating an antenna directivity suitable for each state of a terminal or each arrival direction of a radio wave from the terminal measured in a scale model in which a structure within a predetermined area is reduced at a predetermined scale factor; collection circuitry configured to collect a state of a terminal or an arrival direction of a radio wave from the terminal in practice within a predetermined area; and controller configured to control directivity of the directional antenna with respect to the terminal in practice within a predetermined area based on the state of the terminal or the arrival direction and data.
    Type: Application
    Filed: November 1, 2021
    Publication date: December 26, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoki MURAKAMI, Masashi IWABUCHI, Riku OMIYA, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240373249
    Abstract: A reflection unit of a relay apparatus includes a plurality of reflection elements capable of applying independent phase shifts to an incoming wave from a transmission point. The reflection unit estimates a distance between the relay apparatus and a reception point based on terminal information transmitted from the reception point. The number of divisions for grouping the plurality of reflection elements is determined based on the distance. The plurality of reflection elements are grouped into one or more reflection element groups according to the division number. The position of the reception point is estimated based on the terminal information. Each of the reflection element is applied a phase weight so that each of the reflection element groups generates a beam toward the position of a reception point.
    Type: Application
    Filed: August 6, 2021
    Publication date: November 7, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240357389
    Abstract: A user data rate estimation device acquires a reception power in a user, and receives input of information regarding a communication environment of the user. Next, the device calculates a wireless resource to be allocated to the user on the basis of information regarding a bandwidth, a scheduling method, and the number of users included in the information regarding the communication environment, calculates an overhead on the basis of information regarding a communication standard, a frequency band, and a bandwidth included in the information regarding the communication environment, and determines a communication mode on the basis of the reception power or communication quality information converted from the reception power. Then, the device calculates a user data rate on the basis of the wireless resource, the overhead, the communication mode, and information regarding the number of spatial streams included in the information regarding the communication environment.
    Type: Application
    Filed: August 27, 2021
    Publication date: October 24, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Hiroki YOSHIOKA, Masayoshi NABESHIMA, Yasushi TAKATORI
  • Publication number: 20240348289
    Abstract: A wireless communication method of the present disclosure is a wireless communication method in which dual connectivity between a plurality of transmission points and user terminals is used. In the wireless communication method of the present disclosure, a radio link is generated using at least one dynamic reflector between each of a plurality of transmission points and a user terminal. Also, in the wireless communication method of the present disclosure, different data streams are transmitted from the plurality of transmission points to the user terminal via at least one dynamic reflector.
    Type: Application
    Filed: August 6, 2021
    Publication date: October 17, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoghitha RAMAMOORTHI, Masashi IWABUCHI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240340042
    Abstract: A relay apparatus includes a plurality of reflection elements that applies independent phase shifts to an incoming wave, a communication circuitry that receives transmission point information from one or more transmission points, an element allocation circuitry, and a phase control circuitry. The element allocation circuitry determines the number of communication links to be established via the relay apparatus based on the transmission point information, determines the number of reflection elements to be allocated to each of the communication links, and determines a reflection element to be allocated to each of the communication links according to the number of the reflection elements. The phase control circuitry determines the phase weights so that a beam directed to a reception point being a communication destination of each communication link is generated by a reflection wave generated by each reflection element allocated to each of the communication links.
    Type: Application
    Filed: August 6, 2021
    Publication date: October 10, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Yoghitha RAMAMOORTHI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240255590
    Abstract: A wireless communication system includes a terminal device and a control device that controls a wireless communication device that is used in wireless communication with the terminal device. The wireless communication device includes an electromagnet. The terminal device includes a magnetic sensor. The control device switches on and off the electromagnet. The control device acquires information on a first magnetic field detected by the magnetic sensor from the terminal device, when the electromagnet is off. The control device acquires information on a second magnetic field detected by the magnetic sensor from the terminal device, when the electromagnet is on. The control device estimates a direction from the wireless communication device to the terminal device based on a difference between the first magnetic field and the second magnetic field.
    Type: Application
    Filed: August 2, 2021
    Publication date: August 1, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Riku OMIYA, Masashi IWABUCHI, Tomoaki OGAWA, Yasushi TAKATORI
  • Patent number: 12002376
    Abstract: Provided is a system that enables training for catheter surgery without using radiation. The system offering training for catheter surgery includes: a light source; a blood vessel model to which a catheter having a fluorescent agent applied thereto is inserted; a tank in which the blood vessel model is placed; a filter for rejecting white light that is not transmitted through the blood vessel model, of illuminating light from the light source; a camera for imaging fluorescence transmitted through the filter; a driver for changing the attitude of the light source; and a computer that performs a process of reversing black and white of an image signal output from the camera.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: June 4, 2024
    Assignees: RIKEN, UNIVERSITY OF THE RYUKYUS
    Inventors: Hideo Yokota, Yusuke Ohya, Masashi Iwabuchi
  • Publication number: 20240048217
    Abstract: A receiving apparatus comprising: an antenna control unit; a variable characteristic antenna that receives MIMO signals transmitted from a plurality of antennas while switching an antenna characteristic on the basis of a control signal output from the antenna control unit; a conversion unit that samples reception signals received by the variable characteristic antenna at a predetermined sampling period; a signal division unit that extracts each signal from a plurality of signals corresponding to a plurality of antenna characteristics obtained by the conversion unit; and a MIMO signal demodulation unit that performs MIMO demodulation processing on a signal output from the signal division unit, wherein the variable characteristic antenna includes a plurality of parasitic elements, and the antenna control unit outputs a control signal to each of the parasitic elements by providing a time difference among the control signals.
    Type: Application
    Filed: December 7, 2020
    Publication date: February 8, 2024
    Inventors: Tomoki MURAKAMI, Masashi IWABUCHI, Riku OMIYA, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240004053
    Abstract: A wireless communication method according to an embodiment includes: capturing an image by each of relay devices; detecting a position of a person captured in the image on the basis of the image captured by each of the relay devices; determining whether or not a propagation path between a radiation unit and a wireless terminal is in a line of sight on the basis of the detected position of the person and the compass information transmitted by the wireless terminal; measuring each of strengths of radio waves transmitted by the wireless terminal each time the radiation unit changes a direction in which the radio waves are radiated; selecting the relay device in which the propagation path between the radiation unit and the wireless terminal is in the line of sight on the basis of each piece of line-of-sight information indicating a result of the determination; specifying, for each of the relay devices, a direction in which radio waves radiated by the radiation unit are strongest on the basis of each piece of stre
    Type: Application
    Filed: December 2, 2020
    Publication date: January 4, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Riku OMIYA, Masashi IWABUCHI, Tomoki MURAKAMI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20240004052
    Abstract: A wireless communication method according to an embodiment includes: capturing an image by each of radio wave reflection devices; detecting a position of a person captured in the image on the basis of the image captured by each of the radio wave reflection devices; determining whether or not each of propagation paths between a reflection unit and a wireless terminal is in a line of sight on the basis of the detected position of the person and the compass information transmitted by the wireless terminal; selecting the radio wave reflection device in which the propagation path between the reflection unit and the wireless terminal is in the line of sight on the basis of each piece of line-of-sight information indicating a result of the determination; and performing control such that the wireless terminal and the base station perform wireless communication using radio waves reflected by the selected radio wave reflection device.
    Type: Application
    Filed: December 2, 2020
    Publication date: January 4, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Riku OMIYA, Masashi IWABUCHI, Tomoki MURAKAMI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20230362877
    Abstract: A positioning system according to an aspect of the present invention includes a wireless base station device that communicates with a wireless terminal; one or more relay devices that relay a signal between the wireless terminal and the wireless base station device; and a positioning device that estimates a position of the wireless terminal on the basis of a first signal received by the wireless base station device from the wireless terminal via a first relay device, which is one of the one or more relay devices, a position of the one or more relay devices, and a position of the wireless base station device.
    Type: Application
    Filed: March 18, 2020
    Publication date: November 9, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI
  • Publication number: 20230276254
    Abstract: A reflection direction control system includes a reflection unit including a plurality of reflection elements, a direction estimation unit that estimates an incident direction of a radio wave transmitted by a base station to the reflection unit on the basis of base station position information indicating a preset position of the base station, a phase calculation unit that calculates a phase of the radio wave to be reflected by each of the plurality of reflection elements so that the reflection unit reflects the radio waves transmitted by the base station toward the wireless terminal on the basis of the position information of the wireless terminal received from the wireless terminal, and a phase control unit that controls the phase of the radio wave reflected by each of the plurality of reflection elements on the basis of the phase calculated phase calculation unit.
    Type: Application
    Filed: July 20, 2020
    Publication date: August 31, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI, Riku OMIYA, Yasushi TAKATORI
  • Publication number: 20230275622
    Abstract: A relay system includes: one or more radiation units configured to form a beam in a predetermined direction by radiating radio waves from each of a plurality of elements; a detection unit configured to detect a physical environment on a radio wave propagation path that affects the beam formed by the radiation unit; a direction determination unit configured to determine a direction in which the radiation unit should form the beam based on the physical environment detected by the detection unit; a phase calculation unit configured to calculate a phase of radio wave to be radiated by each of the plurality of elements such that the radiation unit forms a beam in the direction determined by the direction determination unit; and a phase control unit configured to control the phase of the radio wave radiated by each of the plurality of elements based on the phase calculated.
    Type: Application
    Filed: July 28, 2020
    Publication date: August 31, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI, Riku OMIYA, Yasushi TAKATORI
  • Publication number: 20230276255
    Abstract: The reflection direction control system includes a plurality of reflection units each including a plurality of reflection elements, a position estimation unit for estimating a position of each of the wireless terminals on the basis of radio waves transmitted to the plurality of reflection parts wireless terminals, a direction estimation unit for estimating an incident direction of the radio waves transmitted by each of the wireless terminals to the reflection units, a phase calculation unit for calculating a phase of the radio waves to be reflected so that the reflection unit reflects the radio waves made incident in the direction estimated by the direction estimation unit in a predetermined direction, and a phase control unit for controlling the phase of the radio waves reflected by each of the plurality of reflection elements on the basis of the phase calculated by the phase calculation unit.
    Type: Application
    Filed: July 20, 2020
    Publication date: August 31, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI, Riku OMIYA, Yasushi TAKATORI
  • Publication number: 20230275624
    Abstract: A reflection direction control method includes an arrival direction estimation step of estimating an arrival direction of radio waves transmitted by a wireless terminal to one or more reflection units each including a plurality of reflection elements capable of dynamically changing phase characteristics when the radio wave is reflected, a phase control step of controlling a phase of a radio wave reflected by each of the plurality of reflection elements so that the reflection unit reflects, in a predetermined direction, the radio wave transmitted from the estimated arrival direction, and a switching step of switching between an antenna mode in which the reflection unit is caused to receive the radio wave of which the arrival direction is estimated and a reflection mode in which the reflection unit is caused to reflect the radio wave.
    Type: Application
    Filed: July 28, 2020
    Publication date: August 31, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Riku OMIYA, Masashi IWABUCHI, Tomoki MURAKAMI, Tomoaki OGAWA, Yasushi TAKATORI
  • Publication number: 20230204750
    Abstract: A wireless transmission device transmits a radio signal with a plurality of beam patterns and outputs transmission beam identifiers corresponding to the beam patterns to an object detection device, a wireless reception device receives the radio signal transmitted by the wireless transmission device with a plurality of beam patterns, measures received signal strength for each of the beam patterns and outputs reception beam identifiers and the received signal strength to the object detection device, and the object detection device detects an object within a detection area on the basis of the transmission beam identifiers, the reception beam identifiers and the received signal strength. This enables device-free object detection by utilizing a beamforming function, so that it is possible to achieve high detection accuracy while preventing increase in cost.
    Type: Application
    Filed: May 15, 2020
    Publication date: June 29, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoki MURAKAMI, Shinya OTSUKI, Masashi IWABUCHI, Tomoaki OGAWA
  • Publication number: 20230209510
    Abstract: A radio base station and a radio terminal perform radio communication based on a TDD scheme. A slot configuration includes allocation of a downlink period and an uplink period to the radio terminal. The relay reflects a signal transmitted from the radio base station or the radio terminal or receives and reradiates the signal to form a transmission path between the radio base station and the radio terminal. A relay characteristic includes a parameter determining a coverage area in which the transmission path is formed. A downlink relay characteristic during the downlink period and an uplink relay characteristic during the uplink period are not common but determined separately. Then, the relay characteristic during the downlink period is set to the downlink relay characteristic, and the relay characteristic during the uplink period is set to the uplink relay characteristic. In other words, the relay characteristic is switched between downlink communication and uplink communication.
    Type: Application
    Filed: May 25, 2020
    Publication date: June 29, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI
  • Publication number: 20230171624
    Abstract: Communication is performed between a radio base station and a radio terminal via a reflector. The radio base station transmits a measurement signal including a beam ID of a transmission beam for measuring communication quality between the radio base station and the radio terminal. The reflector reflects the measurement signal incident on the reflector in multiple reflection directions to generate multiple reflected measurement signals. Moreover, the reflector modulates the incident measurement signal during reflection to add information about a reflection direction ID being different for each of the multiple reflection directions to each of the multiple reflected measurement signals. The radio terminal demodulates a reflected measurement signal received from the reflector to acquire the reflection direction ID and the beam ID.
    Type: Application
    Filed: May 27, 2020
    Publication date: June 1, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI
  • Publication number: 20230114692
    Abstract: A wireless communication system according to an embodiment includes: a wireless base station device configured to perform wireless communication of an orthogonal frequency division multiplexing (OFDM) method; a plurality of dynamic control relay devices for which a reradiation direction of incoming waves is dynamically controllable; and a wireless terminal device configured to perform wireless communication with the wireless base station device. The wireless base station device performs wireless communication with the wireless terminal device using a plurality of propagation paths that go through or do not go through the dynamic control relay devices, and a CP control unit provided in the wireless base station device changes the cyclic prefix length based on whether or not a propagation route from the wireless base station device to the wireless terminal device uses any dynamic control relay device.
    Type: Application
    Filed: March 18, 2020
    Publication date: April 13, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masashi IWABUCHI, Tomoaki OGAWA, Tomoki MURAKAMI