Patents by Inventor Fumihiro Hasegawa

Fumihiro Hasegawa 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: 20220132460
    Abstract: Provided is a radio communication technology with high reliability. A communication system includes a communication terminal, base stations, and a host device of the base stations. A serving base station of the communication terminal or the host device selects, from among the base stations, a positioning base station transmitting a positioning signal for measuring a position of the communication terminal. The positioning base station transmits the positioning signal, and the communication terminal receives the positioning signal.
    Type: Application
    Filed: March 24, 2020
    Publication date: April 28, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadahiro SHIMODA, Mitsuru MOCHIZUKI, Fumihiro HASEGAWA, Kuniyuki SUZUKI, Daichi UCHINO, Kiyoshige NAKAMURA, Noriyuki FUKUI
  • Publication number: 20220131732
    Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.
    Type: Application
    Filed: January 6, 2022
    Publication date: April 28, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Akinori Taira
  • Patent number: 11303406
    Abstract: The base station allocates, to one terminal, at least one transmission layer and allocates at least one resource block that is a minimum allocation unit of a communication resource in each transmission layer, to transmit a signal to the terminal, and includes processing units each associated with one of the transmission layers, the processing units being equal in number to the transmission layers. Each processing unit includes a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal, and an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, based on at least one of a state of a channel between the base station and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: April 12, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akinori Taira, Hiroki Iura, Shigeru Uchida, Mitsuru Mochizuki, Tadahiro Shimoda
  • Patent number: 11303489
    Abstract: A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: April 12, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumihiro Hasegawa, Akinori Taira
  • Patent number: 11290312
    Abstract: A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: March 29, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumihiro Hasegawa, Hiroshi Nishimoto, Akihiro Okazaki, Masatsugu Higashinaka
  • Patent number: 11271786
    Abstract: When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: March 8, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akinori Taira
  • Publication number: 20220026517
    Abstract: A base station includes a reception processing unit that receives a signal for use in positioning transmitted from a terminal device, and a positioning processing unit that computes the location of the terminal device using the signal for use in positioning.
    Type: Application
    Filed: April 25, 2019
    Publication date: January 27, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA, Mitsuru MOCHIZUKI, Tadahiro SHIMODA
  • Publication number: 20220029869
    Abstract: When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).
    Type: Application
    Filed: September 20, 2021
    Publication date: January 27, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA
  • Publication number: 20210378046
    Abstract: Provided is a communication system with low latency and high reliability, etc. Even after transitioning from RRC_CONNECTED to RRC_INACTIVE, a communication terminal device maintains secondary base station configuration information on configuring a secondary base station Even when at least one of a master base station and a secondary base station is changed during the RRC_INACTIVE, the communication terminal device maintains the secondary base station configuration information. The communication terminal device again transitions to the RRC_CONNECTED using the maintained secondary base station configuration information.
    Type: Application
    Filed: June 12, 2019
    Publication date: December 2, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadahiro SHIMODA, Mitsuru MOCHIZUKI, Fumihiro HASEGAWA, Noriyuki FUKUI, Daichi UCHINO
  • Publication number: 20210314791
    Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.
    Type: Application
    Filed: June 17, 2021
    Publication date: October 7, 2021
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akinori Taira
  • Patent number: 11076305
    Abstract: A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: July 27, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Fumihiro Hasegawa, Akinori Taira
  • Publication number: 20210211957
    Abstract: A base station as a transmitter includes: a plurality of antenna units each capable of forming a plurality of beams; a candidate beam grouping unit that performs grouping of each beam formable by the plurality of antenna units, the grouping being performed based on the antenna unit that forms each beam; and a transmission signal generation unit that generates a transmission signal including beam identification information of a beam formed by the plurality of antenna units and group information indicating a group to which the beam belongs, and outputs the transmission signal generated to the antenna unit that forms a beam corresponding to the beam identification information included in the transmission signal.
    Type: Application
    Filed: March 19, 2021
    Publication date: July 8, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenichiro Kamohara, Fumihiro Hasegawa, Hiroshi Nishimoto
  • Patent number: 11050595
    Abstract: The present invention relates to a method implemented by computer means of a communicating entity, for inserting a reference signal for phase tracking, said communicating entity using a discrete Fourier transformation spread orthogonal frequency division multiplexing modulator, characterized in that the method comprises: obtaining a succession of signal samples by inserting said reference signal for phase tracking within a succession of data samples, according to at least one insertion pattern chosen among pre-defined patterns with respect to predetermined criteria of communication conditions, and feeding said modulator with a succession of signal blocks obtained from said succession of signal samples, so as to apply the discrete Fourier transformation after the insertion of the reference signal for phase tracking.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: June 29, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Cristina Ciochina-Duchesne, Fumihiro Hasegawa, Akihiro Okazaki, Akinori Taira
  • Publication number: 20210176096
    Abstract: Provided is a communication system with high reliability, etc. A communication system includes a base station, and a plurality of terminal devices configured to perform radio communication with the base station. When one slot includes a sounding reference signal (SRS) symbol range consisting of one or more symbols allocated to an SRS of a first terminal device, a first symbol range consisting of one or more symbols before the SRS symbol range, and a second symbol range consisting of one or more symbols after the SRS symbol range, a second terminal device different from the first terminal device performs uplink communication to the base station using at least one of the first symbol range and the second symbol range.
    Type: Application
    Filed: March 26, 2019
    Publication date: June 10, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tadahiro SHIMODA, Mitsuru MOCHIZUKI, Fumihiro HASEGAWA, Noriyuki FUKUI
  • Publication number: 20210135805
    Abstract: A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.
    Type: Application
    Filed: January 8, 2021
    Publication date: May 6, 2021
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro HASEGAWA, Akinori TAIRA, Shigeru UCHIDA, Noriyuki FUKUI, Akihiro OKAZAKI, Hiroki IURA
  • Publication number: 20210126753
    Abstract: Provided is a communication system, etc. with low latency and high reliability, under New Radio (NR). A communication system includes a communication terminal device, and a plurality of nodes configured to be connected to the communication terminal device for radio communication and to provide a split bearer for the communication terminal device. The communication terminal device is configured to perform uplink transmission to an uplink transmission node among the plurality of nodes. The uplink transmission node is determined by an uplink transmission node determination process in which a node that provides the uplink transmission from the communication terminal device with lower latency among the plurality of nodes is determined as the uplink transmission node.
    Type: Application
    Filed: November 2, 2018
    Publication date: April 29, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Mitsuru MOCHIZUKI, Tadahiro SHIMODA, Noriyuki FUKUI, Fumihiro HASEGAWA
  • Patent number: 10992506
    Abstract: A transmission device includes a data generation unit to generate a data symbol, a linear processing unit to generate an additional symbol, a power conditioning unit to perform power conditioning on the additional symbol, a frequency-domain multiplexing unit to arrange the additional symbol after the power conditioning and the data symbol along a frequency axis, a conversion unit to convert a signal arranged along the frequency axis by the frequency-domain multiplexing unit into a time domain signal, and a transmission processing unit to transmit the time domain signal. The linear processing unit generates the additional symbol to cause a data portion in a predetermined position in a block, which is a transmission unit of the time domain signal, to be set as a predetermined data group.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: April 27, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Fumihiro Hasegawa
  • Publication number: 20210067388
    Abstract: A transmission device includes a data generation unit to generate a data symbol, a linear processing unit to generate an additional symbol, a power conditioning unit to perform power conditioning on the additional symbol, a frequency-domain multiplexing unit to arrange the additional symbol after the power conditioning and the data symbol along a frequency axis, a conversion unit to convert a signal arranged along the frequency axis by the frequency-domain multiplexing unit into a time domain signal, and a transmission processing unit to transmit the time domain signal. The linear processing unit generates the additional symbol to cause a data portion in a predetermined position in a block, which is a transmission unit of the time domain signal, to be set as a predetermined data group.
    Type: Application
    Filed: January 31, 2018
    Publication date: March 4, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventor: Fumihiro HASEGAWA
  • Patent number: 10931413
    Abstract: A base station (1) according to the present invention includes: a control unit (10) that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit (12-1 to 12-N) that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit (10); and a precoding unit (13) and a transmitting unit (14) that perform space-division multiplexing on signals of one or more layers arranged by the processing unit (12-1 to 12-N), and transmit the multiplexed signals.
    Type: Grant
    Filed: December 7, 2016
    Date of Patent: February 23, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akinori Taira, Shigeru Uchida, Noriyuki Fukui, Akihiro Okazaki, Hiroki Iura
  • Patent number: 10887142
    Abstract: The present invention is a transmitter compatible with a multicarrier block transmission scheme. The transmitter includes: a fixed sequence generation unit that generates a fixed sequence; a data sequence generation unit that converts data symbols into a time domain signal to generate a data signal; a multiplexing unit that divides the fixed sequence into two divisions, places one of the two divisions at the head and another one of the two divisions at the tail of a block, and places a data sequence that is an output signal from the data sequence generation unit between the two divisions to generate a block signal; and an interpolation unit that performs interpolation processing on the block signal.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 5, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Fumihiro Hasegawa, Akihiro Okazaki