Patents by Inventor Yushi SHIRATO
Yushi SHIRATO 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).
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Patent number: 12185120Abstract: An installation candidate presentation device extracts, for each of one or more installation candidates that are candidates for an installation place of a first wireless device, by using planar map data indicating a planar map of a region including the installation candidates, and a target building at which second wireless devices are to be installed, respectively, an outline range of the building, which is visible from the installation candidate. The installation candidate presentation device calculates, for each installation candidate, by using three-dimensional map data indicating a three-dimensional map obtained by measuring the same region as the planar map data, area of part of a wall surface corresponding to the extracted outline range, the part being visible from the installation candidate, and calculates a total of the area calculated for the building in the region. The installation candidate presentation device presents an installation candidate selected based on the calculated total.Type: GrantFiled: January 8, 2020Date of Patent: December 31, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hideyuki Tsuboi, Kazuto Goto, Hideki Toshinaga, Yushi Shirato, Naoki Kita
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Publication number: 20240413905Abstract: An aspect of the present invention is a wireless communication system including an accommodation station device and a base station device connected to the accommodation station device through an optical transmission path and having n (n is an integer of 2 or more) antenna elements, wherein a plurality of optical signals having different wavelengths propagate through the optical transmission path, the wireless communication system including a prior information acquisition unit configured to execute prior information acquisition processing for acquiring, as prior information, dispersion phase difference information that is information including a dispersion phase difference that is a phase rotation amount difference generated between adjacent optical signals on a wavelength axis due to propagation of the optical signals through the optical transmission path, and a compensation phase shift unit configured to execute compensation phase shift processing for reducing a difference from a phase difference reference tType: ApplicationFiled: February 12, 2021Publication date: December 12, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki SUGA, Kota ITO, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Publication number: 20240405910Abstract: A wireless communication method wherein among a signal processing function and a communication function provided by a wireless communication device, a centralized unit having a signal processing function transmits an optical signal having a form corresponding to a downstream radio signal to be a transmission target in the communication function, to a communication target radio unit which communicates with an external communication device among two or more radio units having a communication function connected to the centralized unit via an optical fiber, and performs beam forming control of the communication target radio unit, and the communication target radio unit, according to control of the centralized unit, communicates with the external communication device.Type: ApplicationFiled: January 27, 2021Publication date: December 5, 2024Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Daisei UCHIDA, Naoki KITA, Takeshi ONIZAWA
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Patent number: 12160268Abstract: A communication system includes a central station device and a base station device. The central station device includes: a plurality of signal processing units, each generating an electrical signal of a wireless signal by performing signal processing corresponding to a wireless system; a conversion unit that generates an optical signal by performing intensity modulation on the electrical signal; and a signal processing control unit that controls the conversion unit to generate an optical signal in which a plurality of the electrical signals are multiplexed. The base station device includes: an electrical signal generation unit that receives the optical signal generated in the central station device via an optical transmission path and converts the received optical signal into a plurality of electrical signals; and a plurality of antenna devices, each wirelessly transmitting the wireless signal according to the electrical signal generated by the electrical signal generation unit.Type: GrantFiled: June 25, 2020Date of Patent: December 3, 2024Assignee: Nippon Telegraph and Telephone CorporationInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Publication number: 20240372611Abstract: According to one aspect of the present invention, there is provided a radio communication device that performs communication with a terminal-side communication device having an antenna using an analog signal for transmitting information by a waveform of an amplitude or a phase of light to receive a signal received by the antenna and transmit a signal radiated by the antenna, the terminal-side communication device and the radio communication device being included in a radio communication system that performs radio communication with a communication target terminal via the antenna using time division duplex (TDD), the radio communication device including: an uplink delay adjustment unit configured to adjust a delay caused by propagation of an uplink signal that is a signal flowing from the terminal to the radio communication device via the antenna; and a downlink delay adjustment unit configured to adjust a delay caused by propagation of a downlink signal that is a signal flowing from the radio communication deType: ApplicationFiled: August 5, 2021Publication date: November 7, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takuto ARAI, Hideki TOSHINAGA, Naoki KITA, Yushi SHIRATO, Daisei UCHIDA, Mizuki SUGA, Kota ITO
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Patent number: 12120532Abstract: On two-dimensional map data indicating buildings serving as candidates for installing terminal station devices, locations of base station installation structures serving as candidates for installing base station devices are set as base station candidate locations, and for each of the base station candidate locations, buildings that have other buildings between themselves and the base station candidate location are selected as visibility detection subject buildings. The heights of the buildings are set at an identical length, a higher position than the buildings is set as an installation altitude of the base station devices, and for each selected visibility detection subject building, a visibility range of the visibility detection subject building from the installation altitude of the base station device in the base station candidate location is detected.Type: GrantFiled: October 18, 2019Date of Patent: October 15, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hideyuki Tsuboi, Hideki Toshinaga, Kazuto Goto, Shuki Wai, Yushi Shirato, Naoki Kita, Takeshi Onizawa
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Publication number: 20240275491Abstract: A wireless communication method in a wireless communication system including an exchange device and a base station device configured to perform beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device inputs an electrical signal based on the optically modulated signal to a beamforming circuit having an input port corresponding to the number of combinations of the optical wavelength, the frequency, and the optical polarization or the number of frequencies to perform beamforming in a direction corresponding to the inpuType: ApplicationFiled: May 17, 2021Publication date: August 15, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Patent number: 12063079Abstract: A base station apparatus includes a centralized station apparatus and a plurality of access points connected to the centralized station apparatus via optical fibers. Based on propagation delay times in the optical fibers, the centralized station apparatus performs grouping such that access points, among a plurality of access points, with a difference in propagation delay time within a threshold value, belong to the same group. The plurality of access points perform connection processing for each of the groups, to communicate with wireless terminals subordinate to the plurality of access points.Type: GrantFiled: December 17, 2019Date of Patent: August 13, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Chunhsiang Huang, Yushi Shirato, Naoki Kita
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Publication number: 20240267122Abstract: A wireless communication method in a wireless communication system including an accommodation station device and a base station device that performs beam formation according to control of the accommodation station device, includes: transmitting an optical modulation signal generated by performing intensity modulation on an optical signal on the basis of a transmission signal to be transmitted to the base station device via an optical transmission line by the accommodation station device controlling any combination of a light wavelength, a frequency, or an optical polarized wave, or a plurality of frequencies or a plurality of light wavelengths, to perform beamforming control of the base station device; transmitting the optical modulation signal after dispersion compensation is performed in an electrical domain or an optical domain in the accommodation station device or performing dispersion compensation on the optical modulation signal on the optical transmission line; and inputting, by the base station devicType: ApplicationFiled: June 23, 2021Publication date: August 8, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Publication number: 20240259098Abstract: A wireless communication method in a wireless communication system including an exchange device and a base station device that performs beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device performs beamforming in a direction in which a wireless signal radiated from an antenna to which an electrical signal based on the optically modulated signal has been input is reflected by a reflector or is transmitted through a lens among antennas corresponding to the number of combinations of the optical wavelength, the frequType: ApplicationFiled: May 17, 2021Publication date: August 1, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Naoki KITA
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Patent number: 12040554Abstract: A wireless communication device is presented. The wireless communication device includes: a high-frequency circuit; and an analog signal processing circuit that performs gain adjustment such that a gain for each of the plurality of antenna elements, in case of a signal transmission or in case of a signal reception, is a predetermined value being dependent on a position of the antenna element. The analog signal processing circuit includes a first splitter/combiner between the high-frequency circuit and the plurality of antenna elements. For each antenna element in the plurality of antenna elements, a second splitter/combiner is coupled to a particular antenna element in the plurality of antenna elements and, for each antenna element in the plurality of antenna elements, two or more phase shifters of a given M system are connected in parallel with each other and coupled between the first splitter/combiner and a corresponding second splitter/combiner.Type: GrantFiled: March 19, 2019Date of Patent: July 16, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Ota, Naoki Kita, Yushi Shirato, Kazuto Goto, Kota Ito, Chunhsiang Huang
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Patent number: 12009862Abstract: An accommodation station transmission unit modulates light to generate an optical signal based on an RF signal and outputs the generated optical signal, a base station transmission unit obtains the optical signal from an input port, demultiplexes the obtained optical signal for each wavelength, outputs the demultiplexed optical signals from output ports of corresponding wavelengths from among a plurality of output ports allocated to each of the wavelengths of the light, and demodulates the RF signal by converting the optical signals output by the output ports into electrical signals, a plurality of transmission antennas emit the demodulated RF signal, and a reflect array or a transmit array receives the RF signal emitted by each of the transmission antennas and forms a transmission beam in a different direction for each position of the transmission antenna that is a transmission source of the RF signal for each RF signal.Type: GrantFiled: November 25, 2019Date of Patent: June 11, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Patent number: 11974312Abstract: An allocation method for allocating individual downlink data signals to positions on a time axis when a base station transmits the individual downlink data signals to a plurality of terminal stations. The allocation method includes provisionally allocating individual downlink data signals of the individual downlink data signals for terminal stations having long propagation delay times to positions of relatively early timings and provisionally allocating individual downlink data signals of the individual downlink data signal for terminal stations having short propagation delay times to positions of relatively late timings, changing the positions such that, when it is estimated that a collision will occur when receiving response signals transmitted from the terminal stations, it is estimated that a collision will not occur, in the provisionally allocating, and fixing, as the positions of the individual downlink data signals on the time axis, the positions changed in the changing of the positions.Type: GrantFiled: January 31, 2020Date of Patent: April 30, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazuto Goto, Hideki Toshinaga, Yushi Shirato, Mizuki Suga, Kota Ito, Naoki Kita
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Patent number: 11956643Abstract: A station placement design method includes: extracting candidates for an installation location of a wireless base station from point group data in accordance with designated conditions for an installation location of a wireless base station; determining presence/absence of visibility between a plurality of designated wireless terminal stations and the candidates for an installation location of a wireless base station based on the point group data and generating a first list including information in which the candidates for an installation location of a wireless base station and wireless terminal stations determined to have presence of visibility for the candidates for an installation location of a wireless base station are associated with each other; generating a second list including information representing combinations of the candidates for an installation location of a wireless base station that enable all of the plurality of designated wireless terminal stations to be accommodated based on the first listType: GrantFiled: January 15, 2020Date of Patent: April 9, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hideki Toshinaga, Naoki Kita, Yushi Shirato, Hideyuki Tsuboi, Kazuto Goto
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Patent number: 11936429Abstract: An accommodation station transmission unit modulates light based on an RF signal to generate an optical signal and outputs the generated optical signal, a base station transmission unit demultiplexes the output optical signal for each of wavelengths, outputs the demultiplexed optical signals, converts the demultiplexed optical signals into electrical signals to demodulate the RF signal, outputs the demodulated RF signal, and each of first ports of a matrix operation unit including the plurality of first ports and a plurality of second ports and configured to use each of the first ports as a reference port and perform, on signals obtained by the reference ports, a BFN matrix operation of performing phase changes that are different for each of positions of the reference ports and cause each of phases of signals output from the plurality of second ports to have a linear inclination receives the demodulated RF signal and forms transmission beams in different directions for each of wavelengths by a plurality of trType: GrantFiled: November 25, 2019Date of Patent: March 19, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Mizuki Suga, Yushi Shirato, Naoki Kita
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Patent number: 11916610Abstract: An interference evaluation method for evaluating, over an area, radio-wave interference that occurs between a first radio station and a second radio station includes: a distinguishing step of acquiring information indicating topographic cross-sections of respective azimuths centered about the first radio station, and distinguishing the topographic cross-section into a segment in which there is visibility from the position of the first radio station and a segment in which there is no visibility from the position of the first radio station; and a specification step of specifying a position at which a desired interference amount is reached based on a distance between the first radio station and the second radio station in a segment distinguished as having visibility from the position of the first radio station, and specifying a position at which the desired interference amount is reached by evaluating the radio-wave interference for each square of an evaluation target region segmented into squares in a segment dType: GrantFiled: March 11, 2020Date of Patent: February 27, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hideyuki Tsuboi, Hideki Toshinaga, Kazuto Goto, Yushi Shirato, Naoki Kita
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Publication number: 20240063907Abstract: A radio communication method performed by a radio communication device includes an inverse fast Fourier transform step of performing inverse fast Fourier transform on a digital electric signal associated with a downlink radio signal, a digital-to-analogue conversion step of converting the digital electric signal subjected to the inverse fast Fourier transform into a first analogue electric signal, an electro-optic conversion step of converting the first analogue electric signal into an optical signal, a step of transmitting the optical signal, a photoelectric conversion step of converting the transmitted optical signal into a second analogue electric signal, and a step of transmitting the downlink radio signal corresponding to the second analogue electric signal.Type: ApplicationFiled: January 22, 2021Publication date: February 22, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota ITO, Mizuki SUGA, Takuto ARAI, Yushi SHIRATO, Daisei UCHIDA, Naoki KITA, Takeshi ONIZAWA
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Patent number: 11902005Abstract: Using an array antenna in which a spacing between adjacent antenna elements is constant, each of combinations of two antenna elements in positions symmetrical relative to a center of an array is connected by wire connections in two paths, and a path length between the antenna elements in the combination of two antenna elements is the same in all of the combinations: a phase adjustment amount is calculated for each wire connection aside from a reference wire connection on the basis of an arrival direction of a wireless signal received by one antenna element in the combination of two antenna elements and a re-radiation direction of a wireless signal transmitted as a re-radiated wave by the other antenna element corresponding to the one antenna element, taking into account a phase difference between a signal transmitted by the wire connections connected to the one antenna element and a signal transmitted by the reference wire connection; and phase rotation is applied to the signal transmitted by the wire connectType: GrantFiled: August 1, 2019Date of Patent: February 13, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kota Ito, Yushi Shirato, Naoki Kita, Takeshi Onizawa
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Patent number: 11902799Abstract: Point cloud data between a base station device and a terminal station device is acquired as a point cloud data group. A radius of a first Fresnel zone defined by the base station device and the terminal station device at each position where the point cloud data group is acquired is calculated. A region specified by the radius at each position where the point cloud data group is acquired is scanned to detect the point cloud data, and a non-line-of-sight region is extracted. A ratio of a total area of all the extracted non-line-of-sight regions to an area of a region constructed by the first Fresnel zone is calculated. A received power is estimated based on the calculated ratio between the areas. Whether or not there is a line of sight between the base station device and the terminal station device is determined based on the received power.Type: GrantFiled: December 12, 2019Date of Patent: February 13, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kazuto Goto, Hideki Toshinaga, Hideyuki Tsuboi, Yushi Shirato, Naoki Kita
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Patent number: 11804901Abstract: A derivation method includes: a transmission step of transmitting, to a wireless terminal, a first radio-wave signal according to an optical signal with a first wavelength and a second radio-wave signal according to an optical signal with a second wavelength; a communication start time information acquisition step of acquiring information on a first communication start time and information on a second communication start time; a reception time information acquisition step of acquiring information on a first reception time and information on a second reception time; a transmission time period derivation step of deriving a first round trip time and deriving a second round trip time; and an optical fiber length derivation step of deriving an optical fiber length, based on the first round trip time, the second round trip time, a group velocity or a group delay time of the optical signal with the first wavelength, and a group velocity or a group delay time of the optical signal with the second wavelength.Type: GrantFiled: January 31, 2020Date of Patent: October 31, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mizuki Suga, Kota Ito, Yushi Shirato, Naoki Kita