公开(公告)号：US20230261744A1

公开(公告)日：2023-08-17

申请号：US18015403

申请日：2020-07-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Hirotaka UJIKAWA ,  Hirotaka NAKAMURA

IPC: H04B10/079 ,  H04B10/077

CPC classification number: H04B10/0791 ,  H04B10/0771

Abstract: A communication device is connected to a wavelength-multiplexed optical ring network, and performs communication by performing time-division multiplexing on optical signals at each wavelength. In a case where a control signal transmitted from the master communication device is not received in a predetermined period, the communication device instructs a scheduler unit to suspend transmission of data at a failure wavelength that is the wavelength at which the host communication device has been determined not to be operating properly, also instructs the scheduler unit to transmit the data stored in the buffer of the failure wavelength at another wavelength, and suspends allocation of new data to the buffer of the failure wavelength. Thus, the delay in transmission of data at the failure wavelength can be shortened.

公开(公告)号：US20230275682A1

公开(公告)日：2023-08-31

申请号：US18015435

申请日：2020-07-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Hirotaka UJIKAWA ,  Hirotaka NAKAMURA

IPC: H04J14/08

CPC classification number: H04J14/08

Abstract: A communication device includes: a communication unit that is connected to an optical ring network, conducts optical signal communication by time-division multiplexing, and receives a control signal for controlling an optical signal transmission timing from a master communication device; and a determination unit that determines the master communication device not to be operating properly and causes the subject communication device to operate as a new master communication device, in a case where the control signal is not received in a predetermined period. Thus, even in a case where the master device cannot operate properly, a slave device operates as the master device, so that the system operation can be continued.

公开(公告)号：US20230421934A1

公开(公告)日：2023-12-28

申请号：US18037072

申请日：2020-11-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Hirotaka UJIKAWA ,  Yoshihito SAKAI

IPC: H04Q11/00 ,  H04B10/032

CPC classification number: H04Q11/0067 ,  H04B10/032 ,  H04Q2011/0081

Abstract: Provided are a communication control device, a communication control system, a communication control method, and a communication control program that make it difficult to reduce band utilization efficiency. In an OLT server 9b that is a communication control device, a transmission time storage unit 12 stores a transmission time of an optical signal between each ONU 3 and OLT 4. An optical transmission control unit 13 generates control information for controlling transmission start and transmission end of optical signals in each ONU 3. A failure detection suppression unit 15 calculates a first time at which the reception of the optical signal from an ONU 3p ends using control information and a transmission time. The failure detection suppression unit 15 calculates a second time at which synchronization processing ends after the reception of the optical signal from an ONU 3q that transmits the optical signal next after the ONU 3p is started using the synchronization time until the synchronization processing acquired by a synchronization time acquisition unit 14 ends. The failure detection suppression unit 15 causes the failure detection unit 11 that detects a link failure in an OLT 4 to suppress detection of a link failure from the first time to the second time.

公开(公告)号：US20210297308A1

公开(公告)日：2021-09-23

申请号：US17258416

申请日：2019-07-05

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Takashi MITSUI ,  Tomoya HATANO

IPC: H04L12/24 ,  H04L12/44 ,  H04Q11/00

Abstract: A communication device including a first communication device and a plurality of second communication devices in an optical access system in which a first communication device and the plurality of second communication devices perform communications with each other under a time division multiple access scheme includes an Ethernet controller configured to implement the communications as Ethernet (registered trademark) communications, and a link failure processing unit configured to output, in response to reception of a link failure notification for notifying occurrence of a link failure in the communications from the first communication device, a termination instruction to terminate data transmission when the communication device is performing the data transmission to the first communication device, and a start instruction to start the data transmission after recovery from the link failure when the communication device is not performing the data transmission to the first communication device.

公开(公告)号：US20230318730A1

公开(公告)日：2023-10-05

申请号：US18015680

申请日：2020-07-15

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Hirotaka UJIKAWA ,  Hirotaka NAKAMURA

IPC: H04J14/02

CPC classification number: H04J14/0227 ,  H04J14/0201

Abstract: A communication device that is connected to a wavelength-multiplexed optical ring network and conducts communication by performing time-division multiplexing on an optical signal for each wavelength includes: a communication unit that transmits a requested transmission amount for requesting a transmission band to a master communication device, and receives an allowed transmission amount for allocating a transmission band from the master communication device; and a control unit that estimates a band utilization rate of each wavelength on the basis of the requested transmission amount and the allowed transmission amount, and allocates data to the respective wavelengths so as to equalize the band utilization rates among the wavelengths. Thus, it is possible to equalize band utilization rates among wavelengths, and enhance communication efficiency of the entire system.

公开(公告)号：US20210168022A1

公开(公告)日：2021-06-03

申请号：US17258589

申请日：2019-06-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Takashi MITSUI ,  Tomoya HATANO

IPC: H04L12/24 ,  H04J14/08 ,  H04L12/801

Abstract: A first communication device in an optical access system in which the first communication device and a plurality of second communication devices communicate through a time division multiple access scheme includes: an Ethernet (registered trademark) controller configured to implement a communication as an Ethernet communication; a link failure detection unit configured to detect, when the plurality of second communication devices perform an initial connection to a network in the optical access system, whether a link failure has occurred based on collision detection of an optical signal transmitted by each of the plurality of second communication devices; and a signal processing unit configured to output, when the link failure detection unit detects that the link failure has not occurred, an initial connection start notification for causing initiation of a processing of the initial connection.

公开(公告)号：US20210051382A1

公开(公告)日：2021-02-18

申请号：US16976357

申请日：2019-02-21

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Takashi MITSUI ,  Kota ASAKA ,  Tomoya HATANO

IPC: H04Q11/00

Abstract: Transmitting devices used in an optical access system in which a plurality of the transmitting devices transmit an optical burst signal to a receiving device by time division multiple access, the transmitting devices each including an arithmetic processing unit, the arithmetic processing unit including: a data signal transmission instruction unit, the a data signal transmission instruction unit that outputs a first instruction for controlling transmission processing of a data signal on the basis of a requester's instruction; an optical signal control instruction unit that outputs a second instruction for controlling output processing of an optical signal on the basis of the requester's instruction; and an instruction output adjustment unit that adjusts a timing at which the first instruction is output and a timing at which the second instruction is output.

公开(公告)号：US20240275627A1

公开(公告)日：2024-08-15

申请号：US18568692

申请日：2021-06-11

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Yoshihito SAKAI ,  Hirotaka UJIKAWA

IPC: H04L12/28 ,  H04L43/087

CPC classification number: H04L12/28 ,  H04L43/087

Abstract: The signal transfer device receives a periodically transmitted periodic signal and transfers the periodic signal in a reserved window. A control device that controls a signal transfer device includes a storage device configured to store reference information indicating a transmission amount and a transmission period of the periodic signals of each of a plurality of flows received by the signal transfer device. The control device further includes a processor that executes window setting processing based on the reference information. In the window setting processing, the control device sets a schedule of a plurality of windows for each of the plurality of flows in the signal transfer device based on the reference information, and instructs the signal transfer device to reserve the plurality of windows according to the schedule.

公开(公告)号：US20240171521A1

公开(公告)日：2024-05-23

申请号：US18283044

申请日：2021-03-23

Applicant: Nippon Telegraph and Telephone Corporation

Inventor： Takamitsu TOCHINO ,  Tatsuya SHIMADA ,  Keita Takahashi ,  Yoshihito SAKAI

IPC: H04L47/6275 ,  H04L47/56 ,  H04L49/9047

CPC classification number: H04L47/6275 ,  H04L47/56 ,  H04L49/9047

Abstract: A signal transfer device according to an embodiment receives a plurality of signals including an aperiodic signal having a higher priority than other signals, respectively holds the plurality of received signals by a plurality of buffers according to the priority, acquires signal information including at least one of a time at which the aperiodic signal is transmitted or received and a data length of the aperiodic signal, predicts a timing at which the aperiodic signal arrives at the buffer based on the acquired signal information, sets reservation of a period for transmitting the aperiodic signal with priority over other signals based on the predicted timing, controls the plurality of buffers to output the aperiodic signal with priority over other signals in the period in which the reservation is set, and transmits the signal output by the buffer.

公开(公告)号：US20230421506A1

公开(公告)日：2023-12-28

申请号：US18037078

申请日：2020-11-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takamitsu TOCHINO ,  Hirotaka UJIKAWA ,  Yoshihito SAKAI

IPC: H04L47/26 ,  H04Q11/00 ,  H04L43/0882 ,  H04L47/11

CPC classification number: H04L47/266 ,  H04Q11/0067 ,  H04L43/0882 ,  H04L47/11 ,  H04Q2011/0086

Abstract: A user terminal 12-1 can wirelessly or preferentially connect to a router 14 to communicate with an upper network 18, and can communicate with another network 20 via a mobile line. An ONU 16 generates a disconnection notification in a case where congestion exceeding a reference is recognized in the PON communicating with the upper network 18, and generates a connection notification when the congestion is resolved. The router 14 stores the user terminal 12-1 that can communicate with another network 20 among the user terminals 12-1 to 12-4 being connected. In addition, the router 14 disconnects the connection with the user terminal 12-1 that can communicate with another network 20 when the disconnection notification is generated, and attempts reconnection with the user terminal 12-1 that has been disconnected when the connection notification is generated.