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公开(公告)号：US11923911B2
公开(公告)日：2024-03-05
申请号：US17291850
申请日：2019-11-14
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yosuke Fujino , Hiroyuki Fukumoto , Marina Nakano , Kazunori Akabane
Abstract: An underwater acoustic communication system includes a transmission device including N transmitters, and a reception device. The reception device includes M (M is an integer of two or more) receivers configured to receive M reception signal sequences corresponding to N transmission signal sequences transmitted from the N transmitters through sound waves, a beam former configured to suppress multipath waves other than direct waves of the M received reception signal sequences and to generate L (L is an integer of two or more) signal sequences from the M reception signal sequences, and a signal estimation unit configured to estimate the N transmission signal sequences based on the L generated signal sequences.
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公开(公告)号：US11888538B2
公开(公告)日：2024-01-30
申请号：US17774451
申请日：2019-11-12
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yosuke Fujino , Hiroyuki Fukumoto , Kazunori Akabane
Abstract: A receiving apparatus includes: M receivers configured to receive signals based on sound waves propagating in water; M FIR filters configured to perform waveform operation on the signals received by the receivers; a combiner configured to combine output signals of the M FIR filters; and a filter coefficient calculation portion configured to calculate a tap coefficient of the M FIR filters so as to reduce an error of the output signals combined by the combiner. The M FIR filters have a tap length that is shorter than a delay spread that is a possible range between a time of arrival of a direct wave and a time of arrival of a delayed wave of the sound waves.
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公开(公告)号：US11477099B2
公开(公告)日：2022-10-18
申请号：US17434917
申请日：2020-03-10
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yohei Katayama , Kenji Suzuki , Kazumitsu Sakamoto , Yosuke Fujino , Hiroyuki Fukumoto
IPC: H04L43/0817 , G06F11/30
Abstract: A monitoring system comprises a monitoring agent that keeps information related to a communication status of a low-power terminal that communicates under low power, and a monitoring device that monitors the status of the low-power terminal. The monitoring device includes a requesting unit that requests information related to the communication status of the low-power terminal. The monitoring agent includes a response generation unit that generates a response to the request from the monitoring device on a basis of the information related to the communication status of the low-power terminal, and a transmission unit that transmits the response to the monitoring device.
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公开(公告)号：US12127231B2
公开(公告)日：2024-10-22
申请号：US17440960
申请日：2020-03-11
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yohei Katayama , Kenji Suzuki , Kazumitsu Sakamoto , Yosuke Fujino , Hiroyuki Fukumoto
IPC: H04W4/00 , H04W72/541
CPC classification number: H04W72/541
Abstract: A communication control device that transmits a packet to be transmitted to a terminal to a base station that performs wireless communication with the terminal, includes: a terminal classification unit that classifies, on the basis of a magnitude of radio wave interference from a base station different from a neighboring base station, a plurality of the terminals into a first terminal set and a second terminal set that is relatively larger in the magnitude of radio wave interference than the first terminal set; and a transmission unit that transmits, in a case where packets destinations of which are terminals belonging to the first terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at the same timing and transmits, in a case where packets destinations of which are terminals belonging to the second terminal set are to be transmitted to respective neighboring base stations of the terminals, the packets at timings different from each other.
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公开(公告)号：US12063520B2
公开(公告)日：2024-08-13
申请号：US17596396
申请日：2019-06-13
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Kazumitsu Sakamoto , Kenji Suzuki , Yohei Katayama , Yosuke Fujino , Hiroyuki Fukumoto
CPC classification number: H04W16/18 , H04W64/003
Abstract: A station installation designing assistance device that divides a service providing area into a plurality of areas, and performs station installation designing for the plurality of areas in parallel, the station installation designing assistance device including: an area dividing unit that divides an entirety of the service providing area into the plurality of areas; a station installation priority determining unit that determines, for each of the plurality of areas, station installation priorities of station installation location candidates that are present in the area; and a station installation priority adjusting unit that adjusts the station installation priorities determined by the station installation priority determining unit, based on a degree of overlap of cells formed as a result of base stations being installed in station installation location candidates in the areas, respectively.
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Patent Agency Ranking
公开(公告)号：US11553421B2
公开(公告)日：2023-01-10
申请号：US17254999
申请日：2019-06-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yosuke Fujino , Shigeru Teruhi , Kazunori Akabane
Abstract: Provided is a wireless communication system in which a first wireless device and a second wireless device intermittently perform wireless communication, in which the first wireless device repeatedly transmits an activation signal for activating the second wireless device at a first cycle until receiving a response signal from the second wireless device, the second wireless device repeatedly executes detection processing of the activation signal at a second cycle that is longer than the first cycle, receives, when a part of the activation signal is detected in the detection processing, the activation signal, transmits, when the activation signal is addressed to the second wireless device itself, the response signal to the first wireless device, the first wireless device transmits, when the response signal is received, data to the second wireless device, and the second wireless device receives, after transmitting the response signal, the data from the first wireless device.
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7.发明授权公开(公告)号：US12143207B2
公开(公告)日：2024-11-12
申请号：US17762651
申请日：2019-09-27
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Marina Nakano , Yosuke Fujino , Hiroyuki Fukumoto , Kazunori Akabane
IPC: H04L1/00 , H04B7/0413
Abstract: A radio transmission apparatus includes a communication distance measurement unit configured to measure a distance between a plurality of transmission antennas and a plurality of reception antennas, a selection unit configured to select a modulation scheme common to all frequency channels, the modulation scheme satisfying an average value of index values for each of the frequency channels according to a measured distance and satisfying a predetermined desired bit error rate, a transmission signal generation unit configured to separate transmission data, modulate each item of the separated transmission data by the selected common modulation scheme, and output the transmission signals multiplexed by the number of multiplexing indicating the number of the plurality of transmission antennas to be used. A radio reception apparatus includes a demodulation unit configured to demodulate a reception signal by a demodulation scheme corresponding to the modulation scheme to generate reception data.
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公开(公告)号：US11848727B2
公开(公告)日：2023-12-19
申请号：US17634207
申请日：2019-08-13
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Marina Nakano , Yosuke Fujino , Hiroyuki Fukumoto , Kazunori Akabane
IPC: H04K1/00 , H04L27/28 , H04B7/0456 , H04B7/06 , H04W28/02
CPC classification number: H04B7/0456 , H04B7/0632 , H04W28/0242 , H04W28/0284
Abstract: A plurality of transmit antennas of a radio transmission device and a plurality of receive antennas of a radio reception device are located under the sea that is a line-of-sight environment, wherein the radio transmission device selects a frequency channel to be used based on an index value per frequency channel indicating orthogonality between the transmit and receive antennas defined based on a distance between the transmit and receive antennas and an angle indicating a direction of arrival of a radio signal, an interval between the plurality of transmit antennas, an interval between the plurality of receive antennas, and a modulation scheme, the distance between the transmit and receive antennas and the angle indicating the direction of arrival of the radio signal estimated by the radio reception device, and a desired bit error rate to be predetermined, selects the modulation scheme for providing a maximum transmission capacity per the selected frequency channel, separates transmission data into a plurality of pieces of transmission data the number of which corresponds to the number of frequency channels, modulates each of the plurality of pieces of transmission data separated in accordance with the selected modulation scheme, and outputs a transmission signal obtained by multiplexing, with a multiplexing order, each of the plurality of pieces of transmission data, the multiplexing order indicating the number of transmit antennas of the plurality of transmit antennas to be used.
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公开(公告)号：US20230379821A1
公开(公告)日：2023-11-23
申请号：US18030314
申请日：2020-10-15
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Kento Yoshizawa , Yosuke Fujino , Yohei Katayama , Ryo Miyatake
IPC: H04W52/02
CPC classification number: H04W52/0225
Abstract: An aspect of the present invention provides a wireless communication system including: one or more terminal devices that transitions between a first state in which a wireless signal can be intermittently detected and a second state in which a wireless signal can be transmitted and received; and a gateway device that transmits an instruction frame instructing the one or more terminal devices to transition to the second state at a predetermined transmission interval. Each of the one or more terminal devices includes: an instruction frame detector that detects the instruction frame at a detection interval longer than an interval at which the gateway device transmits the instruction frame; a preamble signal detector that detects a preamble signal at a predetermined time interval and a predetermined frequency channel when the instruction frame is detected; and a control unit that causes a subject terminal device to transition from the first state to the second state based on a detection result of one or more preamble signals in one or more frequency channels.
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公开(公告)号：US20220131778A1
公开(公告)日：2022-04-28
申请号：US17434917
申请日：2020-03-10
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Yohei Katayama , Kenji Suzuki , Kazumitsu Sakamoto , Yosuke Fujino , Hiroyuki FUKUMOTO
IPC: H04L43/0817 , G06F11/30
Abstract: A monitoring system comprises a monitoring agent that keeps information related to a communication status of a low-power terminal that communicates under low power, and a monitoring device that monitors the status of the low-power terminal. The monitoring device includes a requesting unit that requests information related to the communication status of the low-power terminal. The monitoring agent includes a response generation unit that generates a response to the request from the monitoring device on a basis of the information related to the communication status of the low-power terminal, and a transmission unit that transmits the response to the monitoring device.
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