Patents by Inventor Takatoshi Ogawa
Takatoshi Ogawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11799624Abstract: A time-synchronization system according to the present disclosure includes a relay apparatus (10) configured to perform time-synchronization with a master apparatus (30) through a transmission system of which a transmission delay changes depending on a transmission direction, and a relay apparatus (20) configured to perform time-synchronization with the relay apparatus (10), in which the relay apparatus (20) transmits information about a difference between first time information obtained by performing time-synchronization with the relay apparatus (10) and second time information obtained from a time-synchronization source to the relay apparatus (10), and the relay apparatus (10) corrects third time information obtained by performing time-synchronization with the master apparatus (30) by using the information about the difference, and performs time-synchronization with a slave apparatus (50) by using the corrected third time information.Type: GrantFiled: March 2, 2020Date of Patent: October 24, 2023Assignee: NEC CORPORATIONInventor: Takatoshi Ogawa
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Publication number: 20220182214Abstract: A time-synchronization system according to the present disclosure includes a relay apparatus (10) configured to perform time-synchronization with a master apparatus (30) through a transmission system of which a transmission delay changes depending on a transmission direction, and a relay apparatus (20) configured to perform time-synchronization with the relay apparatus (10), in which the relay apparatus (20) transmits information about a difference between first time information obtained by performing time-synchronization with the relay apparatus (10) and second time information obtained from a time-synchronization source to the relay apparatus (10), and the relay apparatus (10) corrects third time information obtained by performing time-synchronization with the master apparatus (30) by using the information about the difference, and performs time-synchronization with a slave apparatus (50) by using the corrected third time information.Type: ApplicationFiled: March 2, 2020Publication date: June 9, 2022Applicant: NEC CorporationInventor: Takatoshi OGAWA
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Patent number: 11303324Abstract: A radio transmission apparatus (1) includes: a radio communication unit (2) that performs radio communication by a first radio communication scheme; a radio communication unit (3) that performs radio communication by a second radio communication scheme; an abnormality determination unit (4) that determines whether an abnormality has occurred in the radio communication performed by the radio communication unit (2); and a control unit (5) that controls transmission and reception of management information about the radio transmission apparatus (1) using the radio communication unit (2) or (3). When an abnormality has occurred in the radio communication performed by the radio communication unit (2), the control unit (5) performs control so that the management information is transmitted and received to and from a predetermined apparatus by using the radio communication unit (3).Type: GrantFiled: April 26, 2019Date of Patent: April 12, 2022Assignee: NEC CORPORATIONInventor: Takatoshi Ogawa
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Publication number: 20210378033Abstract: An information processing apparatus includes position information acquisition means that acquires position information; configuration information identification means that identifies, from management information in which position information is associated with configuration information for configuring a wireless transmission apparatus, one or more items of configuration information corresponding to the position information acquired by the position information acquisition means; reception means that, in a case in which two or more items of the configuration information corresponding to the position information are identified by the configuration information identification means, receives a user input for selecting one of the two or more items of configuration information that have been identified; and determination means that determines the configuration information to be used to configure the wireless transmission apparatus on the basis of the user input that has been received.Type: ApplicationFiled: May 21, 2021Publication date: December 2, 2021Applicant: NEC CorporationInventor: Takatoshi OGAWA
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Publication number: 20210242902Abstract: A radio transmission apparatus (1) includes: a radio communication unit (2) that performs radio communication by a first radio communication scheme; a radio communication unit (3) that performs radio communication by a second radio communication scheme; an abnormality determination unit (4) that determines whether an abnormality has occurred in the radio communication performed by the radio communication unit (2); and a control unit (5) that controls transmission and reception of management information about the radio transmission apparatus (1) using the radio communication unit (2) or (3). When an abnormality has occurred in the radio communication performed by the radio communication unit (2), the control unit (5) performs control so that the management information is transmitted and received to and from a predetermined apparatus by using the radio communication unit (3).Type: ApplicationFiled: April 26, 2019Publication date: August 5, 2021Applicant: NEC CORPORATIONInventor: Takatoshi OGAWA
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Patent number: 10931434Abstract: An object is to provide a relay apparatus capable of detecting a failure that occurs in the relay apparatus. A relay apparatus (10) according to the present disclosure includes a data reception unit (11) configured to receive a synchronizing packet transmitted from a master apparatus (20), the synchronizing packet containing a time value and a time correction value for correcting the time value, an update unit (12) configured to update the time correction value based on a processing time for the synchronizing packet, and a determination unit (13) configured to determine whether or not a failure has occurred in a functional block related to a process for updating the time correction value by using a result of a comparison between a corrected time value and a reference time value, the corrected time value having been corrected by using the updated time correction value.Type: GrantFiled: August 5, 2016Date of Patent: February 23, 2021Assignee: NEC CORPORATIONInventor: Takatoshi Ogawa
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Patent number: 10901372Abstract: In order to simplify calculation of delay time lengths in a time synchronization device in a packet network, when executing time synchronization using a synchronization signal sent via the packet network, this time synchronization device 20 includes: a data receiving unit 21 that receives synchronization information including a time correction field used when correcting synchronization time information in a client device 30; a before-data-processing time correcting unit 22 that updates the time correction field by subtracting information indicating a time at which synchronization information is received, from the time correction field; an after-data-processing time correcting unit 23 that updates the time correction field by adding information indicating a time after performing data processing on the synchronization information, to the time correction information of the time correction field updated by the before-data-processing time correcting unit 22; and a data sending unit 24 that sends the updated synchrType: GrantFiled: February 10, 2015Date of Patent: January 26, 2021Assignee: NEC CorporationInventor: Takatoshi Ogawa
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Publication number: 20180241538Abstract: An object is to provide a relay apparatus capable of detecting a failure that occurs in the relay apparatus. A relay apparatus (10) according to the present disclosure includes a data reception unit (11) configured to receive a synchronizing packet transmitted from a master apparatus (20), the synchronizing packet containing a time value and a time correction value for correcting the time value, an update unit (12) configured to update the time correction value based on a processing time for the synchronizing packet, and a determination unit (13) configured to determine whether or not a failure has occurred in a functional block related to a process for updating the time correction value by using a result of a comparison between a corrected time value and a reference time value, the corrected time value having been corrected by using the updated time correction value.Type: ApplicationFiled: August 5, 2016Publication date: August 23, 2018Applicant: NEC CorporationInventor: Takatoshi OGAWA
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Publication number: 20180097610Abstract: A synchronization apparatus, a synchronization system, a radio communication apparatus, and a synchronization method capable of reducing the effect of the fluctuations in synchronization signals that arc caused when the synchronization signals arc received through a network are provided. A synchronization apparatus (20) according to the present invention receives a synchronization signal transmitted from a synchronization signal source (10) through a network.Type: ApplicationFiled: November 21, 2017Publication date: April 5, 2018Applicant: NEC CorporationInventor: Takatoshi Ogawa
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Patent number: 9876629Abstract: A communication apparatus (13) according to the present invention is provided with: a storage unit (131) that stored in advance difference information (1311), which is the difference between first time information (t1) and second time information (t2), said first time information (t1) being received from a synchronization source communication apparatus (11) as a time synchronization source connected to a transmission system (12) wherein transmission delay time is different depending on the direction of transmission, and said second time information (t2) obtained from a time synchronization origin (14) other than the transmission system (12); and a time synchronization means (132) that carries out, when the second time information (t2) cannot be obtained from the time synchronization origin (14), time synchronization with the synchronization source communication apparatus (11) using the difference information (1311) read out from the storage unit (131).Type: GrantFiled: October 17, 2016Date of Patent: January 23, 2018Assignee: NEC CorporationInventor: Takatoshi Ogawa
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Patent number: 9838196Abstract: A synchronization apparatus capable of reducing the effect of the fluctuations in synchronization signals that are caused when the synchronization signals are received through a network are provided. A synchronization apparatus (20) according to the present invention receives a synchronization signal transmitted from a synchronization signal source (10) through a network.Type: GrantFiled: August 15, 2013Date of Patent: December 5, 2017Assignee: NEC CoporationInventor: Takatoshi Ogawa
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Patent number: 9763207Abstract: A first synchronization signal for synchronization with a synchronization signal source is acquired from a first signal source. A first signal synchronized with the synchronization signal source is generated based on the first synchronization signal. A second synchronization signal for synchronization with the synchronization signal source is acquired from a second signal source different from the first signal source. A second signal synchronized with the synchronization signal source is generated based on the second synchronization signal. A timing signal synchronized with the synchronization signal source is generated based on the first signal of a synchronization device. A phase difference between the timing signal and the second signal is output. An offset is set so that there is no phase difference between the timing signal and the second signal based on the phase difference.Type: GrantFiled: May 10, 2012Date of Patent: September 12, 2017Assignee: NEC CORPORATIONInventor: Takatoshi Ogawa
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Publication number: 20170176953Abstract: In order to simplify calculation of delay time lengths in a time synchronization device in a packet network, when executing time synchronization using a synchronization signal sent via the packet network, this time synchronization device 20 includes: a data receiving unit 21 that receives synchronization information including a time correction field used when correcting synchronization time information in a client device 30; a before-data-processing time correcting unit 22 that updates the time correction field by subtracting information indicating a time at which synchronization information is received, from the time correction field; an after-data-processing time correcting unit 23 that updates the time correction field by adding information indicating a time after performing data processing on the synchronization information, to the time correction information of the time correction field updated by the before-data-processing time correcting unit 22; and a data sending unit 24 that sends the updated synchrType: ApplicationFiled: February 10, 2015Publication date: June 22, 2017Applicant: NEC CorporationInventor: Takatoshi OGAWA
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Publication number: 20170041128Abstract: A communication apparatus (13) according to the present invention is provided with: a storage unit (131) that stored in advance difference information (1311), which is the difference between first time information (t1) and second time information (t2), said first time information (t1) being received from a synchronization source communication apparatus (11) as a time synchronization source connected to a transmission system (12) wherein transmission delay time is different depending on the direction of transmission, and said second time information (t2) obtained from a time synchronization origin (14) other than the transmission system (12); and a time synchronization means (132) that carries out, when the second time information (t2) cannot be obtained from the time synchronization origin (14), time synchronization with the synchronization source communication apparatus (11) using the difference information (1311) read out from the storage unit (131).Type: ApplicationFiled: October 17, 2016Publication date: February 9, 2017Inventor: Takatoshi OGAWA
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Publication number: 20160119112Abstract: A communication apparatus (13) according to the present invention is provided with: a storage unit (131) that stored in advance difference information (1311), which is the difference between first time information (t1) and second time information (t2), said first time information (t1) being received from a synchronization source communication apparatus (11) as a time synchronization source connected to a transmission system (12) wherein transmission delay time is different depending on the direction of transmission, and said second time information (t2) obtained from a time synchronization origin (14) other than the transmission system (12); and a time synchronization means (132) that carries out, when the second time information (t2) cannot be obtained from the time synchronization origin (14), time synchronization with the synchronization source communication apparatus (11) using the difference information (1311) read out from the storage unit (131).Type: ApplicationFiled: January 4, 2016Publication date: April 28, 2016Inventor: Takatoshi OGAWA
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Patent number: 9258106Abstract: A communication apparatus (13) according to the present invention is provided with: a storage unit (131) that stored in advance difference information (1311), which is the difference between first time information (t1) and second time information (t2), said first time information (t1) being received from a synchronization source communication apparatus (11) as a time synchronization source connected to a transmission system (12) wherein transmission delay time is different depending on the direction of transmission, and said second time information (t2) obtained from a time synchronization origin (14) other than the transmission system (12); and a time synchronization means (132) that carries out, when the second time information (t2) cannot be obtained from the time synchronization origin (14), time synchronization with the synchronization source communication apparatus (11) using the difference information (1311) read out from the storage unit (131).Type: GrantFiled: April 1, 2013Date of Patent: February 9, 2016Assignee: NEC CorporationInventor: Takatoshi Ogawa
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Publication number: 20150295702Abstract: A synchronization apparatus capable of reducing the effect of the fluctuations in synchronization signals that are caused when the synchronization signals are received through a network are provided. A synchronization apparatus (20) according to the present invention receives a synchronization signal transmitted from a synchronization signal source (10) through a network.Type: ApplicationFiled: August 15, 2013Publication date: October 15, 2015Applicant: NEC CorporationInventor: Takatoshi OGAWA
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Publication number: 20150180641Abstract: A communication apparatus (13) according to the present invention is provided with: a storage unit (131) that stored in advance difference information (1311), which is the difference between first time information (t1) and second time information (t2), said first time information (t1) being received from a synchronization source communication apparatus (11) as a time synchronization source connected to a transmission system (12) wherein transmission delay time is different depending on the direction of transmission, and said second time information (t2) obtained from a time synchronization origin (14) other than the transmission system (12); and a time synchronization means (132) that carries out, when the second time information (t2) cannot be obtained from the time synchronization origin (14), time synchronization with the synchronization source communication apparatus (11) using the difference information (1311) read out from the storage unit (131).Type: ApplicationFiled: April 1, 2013Publication date: June 25, 2015Inventor: Takatoshi Ogawa
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Publication number: 20140086234Abstract: A first synchronization signal for synchronization with a synchronization signal source is acquired from a first signal source. A first signal synchronized with the synchronization signal source is generated based on the first synchronization signal. A second synchronization signal for synchronization with the synchronization signal source is acquired from a second signal source different from the first signal source. A second signal synchronized with the synchronization signal source is generated based on the second synchronization signal. A timing signal synchronized with the synchronization signal source is generated based on the first signal of a synchronization device. A phase difference between the timing signal and the second signal is output. An offset is set so that there is no phase difference between the timing signal and the second signal based on the phase difference.Type: ApplicationFiled: May 10, 2012Publication date: March 27, 2014Inventor: Takatoshi Ogawa
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FAULT MONITORING DEVICE HAVING RADIO MAINTENANCE COMMUNICATION FUNCTION, AND FAULT MONITORING METHOD
Publication number: 20140018007Abstract: An outdoor fault monitoring device carries out radio maintenance communication with a maintenance terminal, positioned at a remote place, wherein a fault monitoring function part monitors occurrence/non-occurrence of a fault in a primary device function part. Upon detecting occurrence of a fault, the fault monitoring function part activates a radio maintenance communication function part. Alternatively, the fault monitoring function part deactivates the radio maintenance communication function part due to non-occurrence of a fault. In this case, it is possible to deactivate the radio maintenance communication function part upon detecting disconnection of a radio maintenance communication. Thus, it is possible to improve security against communication jamming created by a malicious person. Additionally, it is possible to suppress power consumption and to reduce a processing load by preventing unnecessary radio communication.Type: ApplicationFiled: March 27, 2012Publication date: January 16, 2014Applicant: NEC CORPORATIONInventors: Takatoshi Ogawa, Hiroaki Miyamoto