公开(公告)号：US20250016479A1

公开(公告)日：2025-01-09

申请号：US18708949

申请日：2021-12-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takuya KANAI ,  Shin KANEKO ,  Naotaka SHIBATA ,  Junichi KANI ,  Tomoaki YOSHIDA

IPC: H04Q11/00 ,  H04B10/27

Abstract: An optical node device to which a first subscriber device and a second subscriber device are connected in an optical communication system in which the first subscriber device and the second subscriber device are mixed, the first subscriber device being connected by one core using different wavelengths in transmission and reception, the second subscriber device being connected by two cores using the same wavelength in transmission and reception, the optical node device including: a transmission/reception separator that transfers an optical signal transmitted from the first subscriber device and an optical signal addressed to the first subscriber device without interference; and an optical switch that controls a connection relationship between ports such that an optical signal transmitted from the first subscriber device or an optical signal addressed to the first subscriber device passes through the transmission/reception separator and an optical signal transmitted from the second subscriber device or an optical signal addressed to the second subscriber device does not pass through the transmission/reception separator, and outputs an optical signal input from a certain optical transmission line from another optical transmission line.

公开(公告)号：US20240372614A1

公开(公告)日：2024-11-07

申请号：US18284535

申请日：2021-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Shin KANEKO ,  Rintaro HARADA

IPC: H04B10/11 ,  H01S5/00 ,  H01S5/02251

Abstract: According to an embodiment, an optical space communication device includes: an optical antenna configured to receive laser light emitted by multiplexing a main signal to be communicated and a control signal used to maintain or control communication; an optical branching element configured to branch the laser light received by the optical antenna into a plurality of pieces of laser light; a first optical fiber configured to transmit one of the pieces of laser light branched by the optical branching element to a light reception element; a second optical fiber configured to have a larger core diameter than a core diameter of the first optical fiber and transmit another piece of laser light branched by the optical branching element to the light reception element; and an extraction unit configured to extract the control signal from the other piece of laser light transmitted by the second optical fiber.

公开(公告)号：US20240201316A1

公开(公告)日：2024-06-20

申请号：US18288011

申请日：2021-05-20

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Kazutaka HARA ,  Ryo IGARASHI

IPC: G01S5/16

CPC classification number: G01S5/16

Abstract: A mobile terminal according to the present invention is configured to: acquire position information from a lighting device which transmits the position information by a change in a light output mode; derive a first distance between a first coordinate and a terminal projection position, the first coordinate indicating a position obtained by projecting, on a projection plane parallel to a floor surface, a first lighting device from which first position information is acquired as the position information, and the terminal projection position being obtained by projecting the mobile terminal on the projection plane; derive a second distance between a second coordinate and the terminal projection position, the second coordinate indicating a position obtained by projecting, on the projection plane, a second lighting device from which second position information is acquired as the position information; acquire a rotation angle of rotation of the mobile terminal on the projection plane from acquisition of the first position information to acquisition of the second position information; and estimate a coordinate indicating the terminal projection position based on the first coordinate, the first distance, the second coordinate, the second distance, and the rotation angle.

公开(公告)号：US20240162982A1

公开(公告)日：2024-05-16

申请号：US18284297

申请日：2021-04-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takeshi IMAI ,  Naotaka SHIBATA ,  Shin KANEKO ,  Rintaro HARADA

IPC: H04B10/112

CPC classification number: H04B10/112

Abstract: According to an embodiment, an optical space communication device includes: an optical antenna configured to receive laser light emitted by multiplexing a main signal to be communicated and a control signal used to maintain or control the communication; an optical branching element configured to branch the laser light received by the optical antenna into first laser light and second laser light; a main signal extraction unit configured to extract the main signal based on the first laser light; a positional deviation detection unit configured to detect a positional deviation of the laser light based on the second laser light; and a control signal extraction unit configured to extract the control signal based on the second laser light.

公开(公告)号：US20230261779A1

公开(公告)日：2023-08-17

申请号：US18012441

申请日：2020-06-29

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Keita TAKAHASHI ,  Hiroko NOMURA ,  Naotaka SHIBATA ,  Tomoya HATANO

IPC: H04J14/02 ,  H04Q11/04

CPC classification number: H04J14/0289 ,  H04Q11/04 ,  H04Q2213/13292

Abstract: Provided is a multiplex transmission system capable of preventing occurrence of a mistake on connection of a client device to a multiplex transmission device. The multiplex transmission system includes: a detection means configured to detect new client connection that is new connection of a client device to a client port of each of a first multiplex transmission device 100 and a second multiplex transmission device 200; and a switch control unit 340 configured to control a switch unit 330 to connect a client port where new client connection is detected at a first time point in the first multiplex transmission device 100 with a client port where new client connection is detected at a second time point in the second multiplex transmission device, when a time interval between the first time point at which new client connection is detected in the first multiplex transmission device 100 and the second time point at which new client connection is detected in the second multiplex transmission device 200 is within a preset reference time, in a case where new client connection is detected in both the first multiplex transmission device 100 and the second multiplex transmission device 200.

公开(公告)号：US20230120832A1

公开(公告)日：2023-04-20

申请号：US17907426

申请日：2020-03-30

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hirotaka UJIKAWA

IPC: H04W24/08 ,  H04W76/10 ,  H04W28/02

Abstract: A monitoring device that monitors a network to which a plurality of terminal devices establishing a connection based on TCP are connected, includes: a request detection unit that detects a connection establishment request that a terminal device becoming a client sends to another terminal device becoming a server; an available bandwidth calculation unit that calculates an available bandwidth by subtracting a current amount of traffic from an allowable communication capacity, for each communication path identified by the connection establishment request detected by the request detection unit; and a setting command unit that, when the available bandwidth calculated by the available bandwidth calculation unit is larger than a preset value, transmits a command that sets the client to enlarge a congestion window to a predetermined value, regardless of presence or absence of an acknowledgement sent by the server.

公开(公告)号：US20220030500A1

公开(公告)日：2022-01-27

申请号：US17298294

申请日：2019-11-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hiroyuki UZAWA ,  Yoichi FUKADA ,  Jun TERADA

IPC: H04W40/02 ,  H04L12/707 ,  H04L12/751

Abstract: A path control method of controlling a communication path in a network including a plurality of wireless devices communicating with a terminal in a wireless manner and a plurality of wireless control devices communicating with any one of the plurality of wireless devices through a plurality of signal transfer devices includes searching for available communication paths and listing the available communication paths for individual combinations of a wireless device of the plurality of wireless devices and a wireless control device of the plurality of wireless control devices, and selecting a combination of communication paths in which a maximum value of the number of communications passing through the same output port of a signal transfer device of the plurality of signal transfer devices is minimized from among the listed available communication paths.

公开(公告)号：US20220007151A1

公开(公告)日：2022-01-06

申请号：US17291259

申请日：2019-10-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hirofumi YAMAMOTO ,  Keita TAKAHASHI ,  Noriyuki OTA ,  Jun TERADA

IPC: H04W4/06 ,  H04B7/155

Abstract: A relay device including: an information storage unit that stores conversion-target header information; a downlink signal dividing unit that divides a downlink signal received from the radio control device into a header and a payload; a signal replicating unit that makes the same number of copies of the payload of the downlink signal as the number of the plurality of destination radio devices; a downlink signal header information conversion unit that performs conversion on the header of the downlink signal for each destination radio device based on the header information stored in the information storage unit; and a signal addition assignment unit that adds the header converted by the downlink signal header information conversion unit to each of the payloads of the downlink signal replicated by the signal replicating unit, and transfers the payloads to the radio devices respectively corresponding thereto.

公开(公告)号：US20250168537A1

公开(公告)日：2025-05-22

申请号：US18727467

申请日：2022-01-14

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Naotaka SHIBATA ,  Shin KANEKO ,  Junichi KANI ,  Tomoaki YOSHIDA

IPC: H04Q11/00

Abstract: An optical communication device includes: a connection switching unit that connects a first communication port connected to a first communication device belonging to a host base to a second communication port connected to a second communication device belonging to the host base, a third communication port connected to a third communication device belonging to another base, or a fourth communication port connected to an electrical processing unit that performs electrical processing for reproduction relay on a signal transmitted to a fourth communication device belonging to the other base; and a control unit that controls switching of connection to the communication ports performed by the connection switching unit on the basis of the base to which the communication device communicating with the first communication device belongs and whether or not the electrical processing is needed.

公开(公告)号：US20250016480A1

公开(公告)日：2025-01-09

申请号：US18709995

申请日：2021-11-19

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Shin KANEKO ,  Takuya KANAI ,  Tomoaki YOSHIDA

IPC: H04Q11/00

Abstract: An aspect of the present invention is an optical transmission device including a connector that is able to be connected to an accommodation module accommodating an optical fiber such that optical communication is performed, an optical switch that receives an optical signal from the connector and outputs an optical signal to the connector, an optical switch controller that controls the optical switch, an up wavelength multiplexer/demultiplexer that multiplexes light of a plurality of wavelengths output from the optical switch and outputs the multiplexed light to a transmission line, and a down wavelength multiplexer/demultiplexer that demultiplexes light input from the transmission line and outputs the demultiplexed light to the optical switch, wherein the connector can be connected to any one of a one-core accommodation module and a two-core accommodation module as the accommodation module.