公开(公告)号：US20210013963A1

公开(公告)日：2021-01-14

申请号：US16968741

申请日：2019-02-13

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Seiki KUWABARA ,  Wataru KAWAKAMI ,  Hideki NISHIZAWA ,  Seiji OKAMOTO ,  Akira HIRANO ,  Shokei KOBAYASHI ,  Tetsuro INUI ,  Takuya ODA ,  Fumikazu INUZUKA ,  Takafumi TANAKA

IPC: H04B10/079

Abstract: A state estimating device includes a pre-processing unit and an estimating unit. The pre-processing unit acquires data representing at one or more of a phase of a signal transmitted from a transmission unit of a transmission device and received at a reception unit of another transmission device via a transmission path, a reception strength, a reception quality, a voltage after conversion into an electric signal, and a signal processing parameter used in reception processing, and processes the acquired data into feature data to be used for state estimation. The estimating unit estimates a state of the transmission path, an abnormal state of the transmission unit, or an abnormal state of the reception unit, on the basis of the feature data.

公开(公告)号：US20240357008A1

公开(公告)日：2024-10-24

申请号：US18687581

申请日：2021-09-06

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Toru MANO ,  Junki ICHIKAWA ,  Yukio TSUKISHIMA ,  Kenji SHIMIZU ,  Hideki NISHIZAWA ,  Tomoya HIBI ,  Kiwami INOUE

IPC: H04L67/1097

CPC classification number: H04L67/1097

Abstract: This communication system comprises a plurality of computers 1, 2 that each comprise: an optical transport path control unit 14 that adjusts the number of optical transport paths between the computer itself and a connection target computer and that sets the adjusted number of optical transport paths; a remote direct memory access (RDMA) communication unit 11 that, in accordance with the number of optical transport paths 4 announced from the optical transport path control unit 14, chunks data that is to be transferred to the connection target computer; and an RDMA control unit 16 that sets RDMA communication paths the number of which is the same as the number of the optical transport paths 4 pursuant to an instruction from the RDMA communication unit 11.

公开(公告)号：US20240414092A1

公开(公告)日：2024-12-12

申请号：US18697928

申请日：2021-10-08

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Tomoya HIBI ,  Junki ICHIKAWA ,  Toru MANO ,  Kazuya ANAZAWA ,  Yukio TSUKISHIMA ,  Kenji SHIMIZU ,  Hideki NISHIZAWA ,  Koichi TAKASUGI

IPC: H04L47/30 ,  H04L49/9005

Abstract: A communication system includes a first intermediate device 10A and a second intermediate device 10B, in which the first intermediate device includes a buffer management unit 15 that determines a buffer size based on delay information and secures a buffer, a transfer unit 11 that, when data to be transferred to a second device 50 is smaller than a credit of the second intermediate device, transfers a request including the data to the second intermediate device, and a generation unit 12A that generates a pseudo-response to the request and returns the pseudo-response to the first device, and the second intermediate device includes a buffer management unit 15 that determines a buffer size based on the delay information and secures a buffer, a transfer unit 11 that transfers the request to the second device and stores the request in the buffer to update the credit of its own device, and a discarding unit 12B that discards a response received from the second device, deletes the request stored in the buffer, and updates the credit.

公开(公告)号：US20240154694A1

公开(公告)日：2024-05-09

申请号：US18279524

申请日：2021-03-02

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takayuki NAKACHI ,  Yitu WANG ,  Yasuhiro MOCHIDA ,  Takahiro YAMAGUCHI ,  Hideki NISHIZAWA

IPC: H04B10/079

CPC classification number: H04B10/0795 ,  H04B10/0791

Abstract: Provided is a concealment signal generation unit that acquires learning constellation data and identification constellation data output from a signal processing circuit for optical communication, reduces and conceals the number of pieces of data from each of the pieces of constellation data through random projection, and generates a learning concealment signal and an identification concealment signal based on each piece of constellation data after the reduction and concealment of the number of pieces of data. Provided are a sparse dictionary learning unit that learns a concealment sparse dictionary using a sparse dictionary learning algorithm based on the learning concealment signal; and an identification unit that estimates a state of the optical communication using the concealment sparse dictionary based on the identification concealment signal.

公开(公告)号：US20240048443A1

公开(公告)日：2024-02-08

申请号：US18266342

申请日：2020-12-09

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takeru INOUE ,  Toru MANO ,  Kazuya ANAZAWA ,  Hideki NISHIZAWA

IPC: H04L41/0823 ,  H04L41/142 ,  H04Q11/00

CPC classification number: H04L41/0823 ,  H04L41/142 ,  H04Q11/0062

Abstract: A connection optimization device that optimizes connections between a plurality of FXC switches for switching connections of optical fibers includes a optimization unit for receiving, as inputs, a number k of FXC switches, a number n of sending/receiving ports, and a connection probability matrix C of the sending/receiving ports and swapping rows and columns of the connection probability matrix C so as to maximize an expected value D in which a connection probability using a short path connecting between the sending/receiving ports connected in the same FXC switch becomes the largest, and a swapping port information output unit for outputting difference information between the connection probability matrix C and the optimization matrix C* in which the rows and the columns are swapped by the optimization unit.

公开(公告)号：US20230412950A1

公开(公告)日：2023-12-21

申请号：US18271572

申请日：2021-01-12

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kazuya ANAZAWA ,  Toru MANO ,  Takeru INOUE ,  Hideki NISHIZAWA

IPC: H04Q11/00

CPC classification number: H04Q11/0062 ,  H04Q2011/0083 ,  H04Q2011/0073

Abstract: An orchestrator includes: a communication request reception unit that receives a communication requirement from a first computer; an optical transport NW design unit that determines an optical path to be used for communication based on the communication requirement and a state of an optical transport path of an optical transport network and calculates setting information to be set to an optical network device of each of a plurality of nodes to construct the optical path; a result output/transmission unit that transmits the setting information to the optical network device to each of the plurality of nodes; and an ACK transmission unit that transmits the setting completion notification to the first computer after receiving a setting completion response of the setting information from the plurality of nodes .

公开(公告)号：US20250094371A1

公开(公告)日：2025-03-20

申请号：US18726624

申请日：2022-01-12

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Kiwami INOUE ,  Junki ICHIKAWA ,  Yukio TSUKISHIMA ,  Kenji SHIMIZU ,  Hideki NISHIZAWA

IPC: G06F13/28

Abstract: A local terminal transmits to a processing device an RDMA transmission packet in which processing data to be transferred to a memory of an accelerator of each of a first remote terminal and a second remote terminal is set. The processing device acquires a QPN from the first remote terminal, converts a Destination QP of a BTH of the RDMA transmission packet into the QPN acquired from the first remote terminal, and transmits a converted RDMA transmission packet to the first remote terminal. When a connection is established, the processing device acquires a QPN from the second remote terminal, converts the Destination QP of the BTH of the RDMA transmission packet into the QPN acquired from the second remote terminal, and transmits a converted RDMA transmission packet to the second remote terminal. Each of the first and second remote terminal transfers the processing data to the memory of the accelerator.

公开(公告)号：US20240146806A1

公开(公告)日：2024-05-02

申请号：US18568618

申请日：2021-06-10

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Junki ICHIKAWA ,  Hideki NISHIZAWA ,  Kenji SHIMIZU ,  Yukio TSUKISHIMA ,  Toru MANO ,  Tomoya HIBI ,  Kiwami INOUE

IPC: H04L67/1097

CPC classification number: H04L67/1097

Abstract: An intermediate device 10A includes a transfer unit 11 that transfers a request including data to be transmitted from a local 30 to a remote 50, and a generation unit 12 that generates a pseudo-response to the request and returns the pseudo-response to the local 30. The intermediate device 10B includes a discard unit 13 that discards a response to the request from the remote 50. An intermediate device 20B includes a generation unit 22 that generates a pseudo-request based on an initial request for requesting data transmission from the local 30 to the remote 50 and transmits the pseudo-request to the remote 50, and a transfer unit 24 that transfers a response including data to be transmitted from the remote 50 to the local 30. The intermediate device 20A includes the discard unit 21 that discards a subsequent request from the local 30.

公开(公告)号：US20230076671A1

公开(公告)日：2023-03-09

申请号：US17797743

申请日：2020-02-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takafumi TANAKA ,  Hideki NISHIZAWA ,  Tetsuro INUI ,  Seiki KUWABARA ,  Shuto YAMAMOTO ,  Seiji OKAMOTO

IPC: H04B10/27 ,  H04B10/07

Abstract: A virtual environment optical communication network is generated by setting configuration parameters of physical packages of a real environment optical communication network in package emulators that a computer program has virtually constructed to implement the physical packages, the real environment optical communication network being constructed by a plurality of node devices in which the physical packages are mounted, pieces of configuration data are generated based on pieces of resource data indicating resources required for optical paths detected based on acquired configuration parameters and a requested transmission mode, optical paths are set in the virtual environment optical communication network based on the generated pieces of configuration data, and optical paths are set in the real environment optical communication network based on the pieces of configuration data that have been used to set the optical paths.

公开(公告)号：US20220303003A1

公开(公告)日：2022-09-22

申请号：US17635275

申请日：2019-09-17

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kengo HORIKOSHI ,  Masanori NAKAMURA ,  Seiji OKAMOTO ,  Hideki NISHIZAWA ,  Etsushi YAMAZAKI

IPC: H04B10/079 ,  H04B10/61 ,  H04B10/2569

Abstract: A signal processing apparatus includes: a coefficient update unit configured to approximate a characteristic of a transmission line of an optical signal by a first tap coefficient vector of which an LO norm is a predetermined value or less; a zeroing unit configured to generate a second tap coefficient vector by replacing, with 0, a tap coefficient of which an absolute value is less than a threshold among tap coefficients of the first tap coefficient vector; and an adaptive filter configured to perform, based on the second tap coefficient vector, adaptive equalization processing on a digital signal corresponding to an optical signal received via the transmission line.