公开(公告)号：US20230140715A1

公开(公告)日：2023-05-04

申请号：US17913388

申请日：2020-03-27

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Hirotaka UJIKAWA

IPC: H04B10/27

Abstract: An optical transmission device which performs relaying between a terminal device and a server via an optical network device, the terminal device and the server establishing connection with each other, includes a request detection unit which detects a connection establishment request transmitted to the server by the optical network device on the basis of a connection establishment request transmitted to the server by the terminal device, a response detection unit which detects an acknowledgment transmitted to the terminal device by the server on the basis of the connection establishment request detected by the request detection unit, and a band allocation unit which, if the response detection unit detects the acknowledgment, performs allocation so as to expand a band over which the optical network device is capable of transmission to the server, regardless of presence or absence of a buffer amount notification to be transmitted by the optical network device.

公开(公告)号：US20230135477A1

公开(公告)日：2023-05-04

申请号：US17910291

申请日：2020-03-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W72/23 ,  H04W88/08

Abstract: In a signal transfer system including a signal transfer management apparatus and a plurality of signal transfer apparatuses connected in multiple stages and forming a network between a distribution station apparatus and a central station apparatus, a signal transfer apparatus on an upper side among the plurality of signal transfer apparatuses transmits a timing adjustment request to at least one of a plurality of signal transfer apparatuses on a lower side when discard of a signal received from the plurality of signal transfer apparatuses on the lower side has been detected or when an amount of traffic of a plurality of signals received from the plurality of signal transfer apparatuses on the lower side exceeds a predetermined threshold value, and the signal transfer apparatus on the lower side that has received the timing adjustment request from the signal transfer apparatus on the upper side adjusts opening and closing timings of a gate based on the timing adjustment request. This can prevent the occurrence of a microburst.

公开(公告)号：US20230120429A1

公开(公告)日：2023-04-20

申请号：US17910277

申请日：2020-03-09

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04L47/62 ,  H04L47/6275

Abstract: In a signal transfer system including a signal transfer management apparatus and a plurality of signal transfer apparatuses connected in multiple stages and forming a network between a distribution station apparatus and a central station apparatus, a signal transfer apparatus on an upper side among the plurality of signal transfer apparatuses transmits a timing adjustment request to at least one of a plurality of signal transfer apparatuses on a lower side among the plurality of signal transfer apparatuses upon determining that there is a possibility that a microburst occurs according to mobile scheduling information received from the plurality of signal transfer apparatuses on the lower side, and the signal transfer apparatus on the lower side that has received the timing adjustment request from the signal transfer apparatus on the upper side adjusts opening and closing timings of a gate based on the timing adjustment request. This can prevent the occurrence of a microburst.

公开(公告)号：US20220294498A1

公开(公告)日：2022-09-15

申请号：US17626110

申请日：2020-07-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Jun TERADA ,  Shinsuke IBI ,  Seiichi SANPEI

IPC: H04B7/0417 ,  H04W16/28 ,  H04B7/0426 ,  H04B7/0456

Abstract: A relay device relaying, to a reception device, a signal stream transmitted by a transmission device through MIMO transmission, the relay device including a lattice base reduction processing unit transforming bases of the signal stream transmitted by the transmission device through MIMO transmission, to increase orthogonality of a lattice of the signal stream, a MIMO equalization unit detecting, by equalization, reception symbols in the signal stream with the bases transformed by the lattice base reduction processing unit, a symbol quantization unit performing quantization by mapping the reception symbols detected by the MIMO equalization unit, to a region on a complex plane delimited by quantization threshold values, and a transmission unit transmitting, to the reception device, at least a signal quantized by the symbol quantization unit.

公开(公告)号：US20220217572A1

公开(公告)日：2022-07-07

申请号：US17429841

申请日：2020-02-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04W28/02 ,  H04L12/46 ,  H04W28/06 ,  H04W72/10

Abstract: There are included a control unit configured to, when detecting that no high priority traffic frame arrives for a frame interval threshold or longer in the period that allows high priority traffic frames to be transmitted, release the period that allows high priority traffic frames to be transmitted and allocate the released period to the period that allows low priority traffic frames to be transmitted, a frame arrival time information acquisition unit configured to obtain information of frame arrival times of high priority traffic frames, a frame interval calculation unit configured to calculate, in accordance with the information of frame arrival times obtained by the frame arrival time information acquisition unit, frame intervals between frames of the high priority traffic frames input in chronological order, a frame interval threshold calculation unit configured to calculate a new frame interval threshold in accordance with the frame intervals, and a frame interval threshold configuration unit configured to change the frame interval threshold to the new frame interval threshold.

公开(公告)号：US20220201493A1

公开(公告)日：2022-06-23

申请号：US17602893

申请日：2020-03-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Keita TAKAHASHI ,  Tatsuya FUKUI ,  Hideaki KIMURA ,  Hirofumi YAMAMOTO ,  Noriyuki OTA ,  Jun TERADA

IPC: H04W16/04 ,  H04W40/02

Abstract: Signal transfer devices that relay base stations of service providers that perform communication with radio terminals and an aggregation station that controls the base stations, and a route control device that controls signal distribution to user network interfaces (UNIs) and network network interfaces (NNIs) of each of the signal transfer devices, are included. The route control device includes an allocation information acquisition unit that acquires allocation information of frequency to each of the base stations; a band adjustment unit that adjusts an MBH band for each of the UNIs, on the basis of correspondence relation information representing a correspondence relation between the UNIs and the service providers, band information indicating a maximum MBH band of each of the UNIs, and the allocation information; and a distribution determination unit that determines signal distribution to each of the NNIs, on the basis of the MBH band adjusted by the band adjustment unit and configuration information representing a connection configuration of each of the signal transfer devices. The signal transfer device transmits a signal from each of the NNIs on the basis of the signal distribution to each of the NNIs determined by the distribution determination unit.

公开(公告)号：US20220200702A1

公开(公告)日：2022-06-23

申请号：US17602954

申请日：2020-03-26

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Keita TAKAHASHI ,  Tatsuya FUKUI ,  Hideaki KIMURA ,  Hirofumi YAMAMOTO ,  Noriyuki OTA ,  Jun TERADA

IPC: H04B10/112 ,  H04J14/02 ,  H04B10/272 ,  H04W72/04

Abstract: An uplink transmission band and a downlink transmission band that are allocated to each of a plurality of users are determined based on allocation information indicating allocation of a frequency bandwidth available to each of the plurality of users, and are output as uplink transmission band allocation information and downlink transmission band allocation information, respectively. Based on the downlink transmission band allocation information, downlink signals output from a plurality of wireless control devices toward a plurality of wireless devices for each of the plurality of users, and the uplink transmission band allocation information are multiplexed, and the multiplexed signal is demultiplexed into downlink signals for each of the plurality of users and the uplink transmission band allocation information. Based on the demultiplexed uplink transmission band allocation information, the uplink transmission band allocated to each of the plurality of users is changed, and uplink signals output from the plurality of wireless devices toward the plurality of wireless control devices for each of the plurality of users are multiplexed according to the changed uplink transmission band and then, the multiplexed signal is demultiplexed into the uplink signals for each of the plurality of users.

公开(公告)号：US20240422457A1

公开(公告)日：2024-12-19

申请号：US18699955

申请日：2021-10-12

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Naotaka SHIBATA ,  Shin KANEKO

IPC: H04Q11/00 ,  H04B10/27

Abstract: An optical communication device includes: a first optical switch that is connected to a plurality of optical transmission lines and outputs an optical signal input from any of the optical transmission lines to another optical transmission line; a second optical switch that is connected to a plurality of optical transmission lines and outputs an optical signal input from any of the optical transmission lines to another optical transmission line; and a transfer unit configured to transfer an optical signal transmitted from a first device connected to the first optical switch to a specific second device connected to the second optical switch.

公开(公告)号：US20240283817A1

公开(公告)日：2024-08-22

申请号：US18563932

申请日：2021-05-28

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Rintaro HARADA ,  Naotaka SHIBATA ,  Shin KANEKO

IPC: H04L9/40

CPC classification number: H04L63/1458

Abstract: A switch in a communication network comprises a controller for controlling a communication flow in the communication network. A suspected flow is a communication flow suspected of being related to a DDoS (Distributed Denial of Service) attack. A normal flow is a communication flow other than the suspected flow. The controller is configured to execute provisional handling when receiving a provisional handling instruction indicating identification information of the suspected flow from a network controller. The provisional handling includes processing of setting a priority of the suspected flow to a designated priority, and processing of setting a priority of the normal flow higher than the designated priority.

公开(公告)号：US20230421257A1

公开(公告)日：2023-12-28

申请号：US18039425

申请日：2020-12-02

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

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

IPC: H04B10/112 ,  H04B10/50 ,  H04B10/60

CPC classification number: H04B10/112 ,  H04B10/503 ,  H04B10/60

Abstract: An optical transmitter (3) tracks a moving body (1) and irradiates the moving body (1) with a laser beam (4). An optical receiver (5) is mounted on the moving body (1), receives the laser beam (4), and performs optical space communication with the optical transmitter (3). The optical transmitter (3) extends an irradiation range (6) of the laser beam (4) into an elliptical shape.