Patents by Inventor Kenichi Kawamura
Kenichi Kawamura 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: 11993030Abstract: A method includes laminating a plurality of fiber reinforced sheets to create a charge; and shaping, by pressing, the charge created in the lamination step into a shaping mold. The charge has a predetermined angle layer including the plurality of fiber reinforced sheets, the fiber direction of which is aligned in a single direction. The predetermined angle layer has n-number of constitutional layers (n?2) ranging from a first constitutional layer to an n-th constitutional layer each including the plurality of fiber reinforced sheets, wherein the n-th constitutional layer is laminated on an (n?1)-th constitutional layer, the plurality of fiber reinforced sheets in each of the constitutional layers have dividing portions which are along the fiber direction and which are disposed one by one at respective positions within a predetermined range along the fiber direction in the predetermined angle layer.Type: GrantFiled: September 26, 2019Date of Patent: May 28, 2024Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Masahiko Shimizu, Shoya Mano, Toshiki Kitazawa, Homare Yamato, Kenichi Kawamura, Yoko Taguchi
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Patent number: 11985650Abstract: A wireless LAN system in which a BSS composed of one wireless LAN base station and a plurality of wireless LAN terminals belonging to the wireless LAN base station, is set as a unit, and a plurality of the BSSs using an identical channel respectively perform uplink multi-user transmission, includes a radio control apparatus that is connected to the wireless LAN base station of each of the plurality of the BSSs and a wireless LAN terminal of the plurality of wireless LAN terminals of each of the plurality of the BSSs, and configured to collect radio information indicating interference states of respective radio waves, group sets of BSSs of the plurality of the BSSs, which are outside of radio wave reachable ranges of each other, as one of a plurality of groups among the plurality of the BSSs using the identical channel according to the radio information, and perform control to shift a timing of channel access for performing uplink multi-user transmission between the plurality of groups.Type: GrantFiled: August 15, 2019Date of Patent: May 14, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shota Nakayama, Kenichi Kawamura, Yasushi Takatori, Keisuke Wakao
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Patent number: 11978885Abstract: An electrode for nonaqueous electrolyte secondary batteries, provided with a collector and a positive electrode active material layer arranged on the collector and contains a positive electrode active material. The positive electrode active material contains compound particles which have a layered structure composed of two or more transition metals, and which have an average particle diameter DSEM of from 1 ?m to 7 ?m (inclusive) based on the observation with an electron microscope, a ratio of the 50% particle diameter D50 in a volume-based cumulative particle size distribution to the average particle diameter DSEM, namely D50/DSEM of from 1 to 4 (inclusive), and a ratio of the 90% particle diameter D90 in the volume-based cumulative particle size distribution to the 10% particle diameter D10 in the volume-based cumulative particle size distribution, namely D90/D10 of 4 or less. The positive electrode active material layer has a void fraction of 10-45%.Type: GrantFiled: October 5, 2021Date of Patent: May 7, 2024Assignees: HONDA MOTOR CO., LTD., NICHIA CORPORATIONInventors: Atsushi Ogawa, Toru Sukigara, Hiroto Maeyama, Soshi Kawamura, Kenichi Kobayashi
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Patent number: 11917682Abstract: Provided is a wireless LAN system in which an interference control signal transmitter that is provided in the surroundings of the wireless LAN base station and the wireless LAN terminal, and is configured to collect wireless environment information regarding the interfering AP/STA, and transmit, to the interfering AP/STA, an interference control signal that is to be used to set a transmission waiting period; and an interference control signal management device configured to collect the wireless environment information from the interference control signal transmitter, determine the interference control signal transmitter whose communication area includes the interfering AP/STA based on the wireless environment information, and control the determined interference control signal transmitter to transmit the interference control signal to be used to set the transmission waiting period that corresponds to a length of time of the communication between the wireless LAN base station and the wireless LAN terminal, wherType: GrantFiled: November 8, 2019Date of Patent: February 27, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Kenichi Kawamura, Yasushi Takatori, Tomoyuki Yamada, Hiroshi Nakamoto, Keisuke Wakao, Shota Nakayama
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Patent number: 11895693Abstract: In a random access radio communication system configured to perform downlink communication from a radio base station to radio terminals by random access, the radio terminals include one or more low latency terminals requiring low latency and one or more non-low latency terminals not requiring low latency, and the low latency terminals and the non-low latency terminals are configured to be distinguished by service set identifiers (SSIDs). The random access radio communication system includes terminal assignment destination control unit of distinguishing the low latency terminals and the non-low latency terminals in accordance with the SSIDs and evenly distributing the terminals into a plurality of communication channels, and random access control unit of performing priority control on the low latency terminals and the non-low latency terminals for each communication channel so that the downlink communication in the low latency terminal satisfies a predetermined delay time.Type: GrantFiled: January 6, 2020Date of Patent: February 6, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomoyuki Yamada, Keisuke Wakao, Kenichi Kawamura, Akira Kishida, Shota Nakayama, Yasushi Takatori, Takatsune Moriyama
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Publication number: 20240040458Abstract: The present disclosure provides a wireless communication system cooperation method appropriate for cooperation between a mobile communication system and a wireless LAN system involving priority control. In a communication area of 5G, a 5QI representing communication quality is allocated to a service data flow, and the communication of the service data flow is performed via a base station so that the communication quality is realized. A priority condition corresponding to 5QI is set for a communication time condition of the wireless LAN (step 100). When the wireless terminal UE to be protected is handed over to the wireless LAN (step 102), a priority condition set based on 5QI is instructed to the access point (step 106). Thereafter, the access point performs communication of the service data flow according to the priority condition.Type: ApplicationFiled: August 25, 2020Publication date: February 1, 2024Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shota NAKAYAMA, Daisuke MURAYAMA, Kenichi KAWAMURA, Takatsune MORIYAMA
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Publication number: 20240032086Abstract: A relay method is executed by a relay device that relays communication between each of terminals accommodated by wireless communication and an external device. The relay method includes setting, for each terminal of the terminals, a time period from storing a packet in a queue until transmitting the packet to the terminal as a first time period; and setting, for each terminal of the terminals, a time interval in which the terminal is allowed to transmit a packet by the wireless communication as a second time period corresponding to the first time period.Type: ApplicationFiled: August 27, 2020Publication date: January 25, 2024Inventors: Shota NAKAYAMA, Kenichi KAWAMURA, Daisuke MURAYAMA, Takatsune MORIYAMA
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Patent number: 11882479Abstract: A wireless LAN communication device generates an MPDU by attaching a MAC header to transmission data, generates an A-MPDU subframe by attaching an MPDU delimiter to the MPDU, generates an A-MPDU by aggregating a plurality of A-MPDU subframes, and transmits the A-MPDU. The wireless LAN communication device includes: an MPDU duplicating means for determining whether or not transmission data is a redundancy target according to a required quality of the transmission data, determining that an MPDU generated from the transmission data determined to be a redundancy target is a redundant MPDU, and generating a duplicate MPDU by duplicating the redundant MPDU; and an A-MPDU generating means for generating an A-MPDU that includes the redundant MPDU and the duplicate MPDU.Type: GrantFiled: November 8, 2019Date of Patent: January 23, 2024Assignee: Nippon Telegraph and Telephone CorporationInventors: Kenichi Kawamura, Yasushi Takatori, Hiroshi Nakamoto, Tomoyuki Yamada, Keisuke Wakao, Shota Nakayama
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Publication number: 20230388812Abstract: A learning method in which a learning device performs learning on a model for estimating wireless quality by machine learning, and the learning method includes a learning step of generating a pre-trained model by performing the learning on the model by using measurement data of wireless quality obtained by a plurality of terminals, and a retraining step of retraining the pre-trained model by using measurement data satisfying a predetermined condition.Type: ApplicationFiled: November 6, 2020Publication date: November 30, 2023Inventors: Keisuke WAKAO, Kenichi KAWAMURA, Takatsune MORIYAMA
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Publication number: 20230328595Abstract: The present disclosure provides a wireless communication system cooperation method appropriate for cooperation between a mobile communication system and a wireless LAN system involving priority control. In a communication area of 5G, a 5QI representing communication quality is allocated to a service data flow, and the communication of the service data flow is performed via a base station so that the communication quality is realized. A priority condition corresponding to 5QI is set for a frequency resource of the wireless LAN (step 100). When the wireless terminal UE to be protected is handed over to the wireless LAN (step 102), a priority condition set based on 5QI is instructed to the access point (step 106). Thereafter, the access point performs communication of the service data flow according to the priority condition.Type: ApplicationFiled: August 25, 2020Publication date: October 12, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shota NAKAYAMA, Daisuke MURAYAMA, Kenichi KAWAMURA, Takatsune MORIYAMA
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Publication number: 20230308893Abstract: A control system includes a base station and a control apparatus for controlling the base station. The control apparatus includes a processor, and a memory that includes instructions, which when executed, cause the processor to identify an area having a line-of-sight relationship in a communication area of the base station for each parameter for determining a transmission point and a transmission direction of a radio wave transmitted from the base station, and calculate an index value regarding the identified area; and control a transmission point and a transmission direction of a radio wave transmitted from the base station by using a parameter in which the index value becomes maximum.Type: ApplicationFiled: August 21, 2020Publication date: September 28, 2023Inventors: Daisuke MURAYAMA, Shota NAKAYAMA, Kenichi KAWAMURA
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Publication number: 20230300707Abstract: There is provided a communication system including: a terminal that communicates with a base station wirelessly; and a control device, in which the terminal includes a transmission unit that transmits information on a location of the terminal, and the control device includes an information collection unit that acquires the information on the location of the terminal, an entry prediction calculation unit that predicts a future location of the terminal based on the information on the location of the terminal and that determines whether the terminal is to enter a dead zone by comparing the future position with the dead zone, and a connection destination control unit that executes control for switching a connection destination of the terminal when the entry prediction calculation unit determines that the terminal is to enter the dead zone.Type: ApplicationFiled: July 27, 2020Publication date: September 21, 2023Inventors: Shota Nakayama, Daisuke MURAYAMA, Kenichi Kawamura, Takatsune Moriyama
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Publication number: 20230276335Abstract: A communication system includes a terminal configured to wirelessly communicate with a base station and a control device. The terminal includes a transmission unit that transmits location information of the terminal. The control device includes a preliminary dead area setting unit that sets an area around a dead zone as a preliminary dead area, an information collection unit that acquires location information of the terminal, and a connection destination control unit that determines whether the terminal is in the preliminary dead area by comparing the location information of the terminal with the preliminary dead area and performs control for switching a connection destination of the terminal when the connection destination control unit determines that the terminal is in the preliminary dead area.Type: ApplicationFiled: July 27, 2020Publication date: August 31, 2023Inventors: Shota Nakayama, Daisuke MURAYAMA, Kenichi Kawamura, Takatsune Moriyama
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Publication number: 20230269637Abstract: A communication system including a terminal configured to wirelessly communicate with a base station, a plurality of IoT terminals, and a control device, in which the control device includes an IoT terminal command unit configured to select an IoT terminal around a dead zone and transmit a command of signal transmission to the selected IoT terminal, the selected IoT terminal includes a command reception unit configured to receive the command, and a signal transmission unit configured to transmit a signal according to the command, and the terminal receiving the signal transmitted from the selected IoT terminal performs a connection operation for avoiding the dead zone.Type: ApplicationFiled: July 27, 2020Publication date: August 24, 2023Inventors: Shota Nakayama, Daisuke MURAYAMA, Kenichi Kawamura, Takatsune Moriyama
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Publication number: 20230254714Abstract: The present disclosure is a local wireless communication system for forming a wireless communication environment on a predetermined band. This system includes a base station that emits a radio wave to form the wireless communication environment in a predetermined area, a plurality of sensors disposed in the area, and a controller that controls a transmission state of the radio wave from the base station. Each of the plurality sensors measures a reception quality of the measurement signal transmitted from the base station and feeds back the reception quality to the controller via the base station. The controller evaluates the reception quality fed back and determines a parameter to be given to the base station in accordance with an evaluation result. The base station transmits the measurement signal in accordance with a parameter given from the controller.Type: ApplicationFiled: June 16, 2020Publication date: August 10, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Daisuke MURAYAMA, Shota NAKAYAMA, Kenichi KAWAMURA
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Publication number: 20230247621Abstract: A specific signal in a radio communication system includes at least one of a synchronization signal and a reference signal. A first radio communication system performing radio communication in a first cell uses a first resource mapping pattern as a resource mapping pattern of the specific signal. A second radio communication system performing radio communication in a second cell that is adjacent to the first cell uses a second resource mapping pattern as a resource mapping pattern of the specific signal. The first resource mapping pattern and the second resource mapping pattern are set so as not to overlap with each other through resource mapping pattern control.Type: ApplicationFiled: June 15, 2020Publication date: August 3, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Daisuke MURAYAMA, Kenichi KAWAMURA
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Publication number: 20230232288Abstract: A specific signal in a radio communication system includes at least one of a synchronization signal and a reference signal. A first radio communication system performing radio communication in a first cell generates the specific signal based on a first seed and uses a first resource mapping pattern as a resource mapping pattern of the specific signal. A second radio communication system performing radio communication in a second cell that is adjacent to the first cell generates the specific signal based on a second seed and uses a second resource mapping pattern as a resource mapping pattern of the specific signal. When the first resource mapping pattern is identical to the second resource mapping pattern, the first seed and the second seed are set to be different from each other through sequence seed control.Type: ApplicationFiled: June 15, 2020Publication date: July 20, 2023Inventors: Daisuke MURAYAMA, Kenichi Kawamura
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Publication number: 20230128921Abstract: A wireless communication method according to an embodiment is a method executed by a wireless terminal apparatus and a quality prediction engine that predicts a quality related to communication performed by the wireless terminal apparatus, and the method includes: by the wireless terminal apparatus, notifying the quality prediction engine of information about a plurality of wireless base stations connectable to the wireless terminal apparatus, model information of the wireless terminal apparatus, information about wireless communication environment around the wireless terminal apparatus, and information detected by a sensor mounted on the wireless terminal apparatus; by the quality prediction engine, calculating, based on the notified information, a predicted value of a communication quality when the wireless terminal apparatus is connected to the plurality of connectable wireless base stations in accordance with a prediction function, and notifying the wireless terminal apparatus of the calculated predictedType: ApplicationFiled: March 2, 2020Publication date: April 27, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Keisuke WAKAO, Kenichi KAWAMURA, Takatsune MORIYAMA, Shota NAKAYAMA
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Publication number: 20230097069Abstract: An embodiment of the present invention is a local wireless communication system that emits a radio wave in a licensed band to form a wireless communication environment in a predetermined area. The system includes a base station configured to emit a radio wave, a plurality of sensors disposed along an edge of the area, and a control apparatus. The sensors each measure a radio field intensity of the radio wave emitted from the base station, and feed the radio field intensity back to the control apparatus via the base station. The control apparatus controls a transmission power of the radio wave from the base station to control the fed radio field intensity.Type: ApplicationFiled: March 2, 2020Publication date: March 30, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Daisuke MURAYAMA, Koichi ISHIHARA, Kenichi KAWAMURA, Takatsune MORIYAMA
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Publication number: 20220408453Abstract: A wireless LAN system where an interfering communication device is present around a base station device and a terminal device includes an interference control signal transmitter that transmits an interference control signal that causes the interfering communication device to wait for transmission, and an interference control signal management device that collects wireless environment information, sets wireless LAN communication between the base station device and the terminal device, which are protection targets, as protected communication, and causes the interference control signal transmitter to transmit an interference control signal that causes the interfering communication device to wait for transmission, and the interference control signal management device instructs the interference control signal transmitter to start transmitting the interference control signal when detecting a start of the protected communication and instructs the interference control signal transmitter to stop transmitting the interType: ApplicationFiled: November 26, 2019Publication date: December 22, 2022Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shota NAKAYAMA, Kenichi KAWAMURA, Takatsune MORIYAMA, Keisuke WAKAO, Yasushi TAKATORI