Patents by Inventor Akihiro Kadohata
Akihiro Kadohata 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: 10587472Abstract: Accommodation design for wavelength and sub-? paths in a communication network is performed. If sub-? path accommodation is possible according to search for a wavelength path present in a single-hop logical route, the accommodation in the wavelength path is executed. If sub-? path accommodation is possible according to search for a wavelength path present in a multi-hop logical route, a logical route is selected based on the wavelength path and the sub-? path is accommodated in the wavelength path. Additionally, each physical route suitable for the sub-? path accommodation is searched for. If the route can accommodate a wavelength path set in a single-hop logical route by available wavelength allocation, the sub-? path is accommodated in the wavelength path. Furthermore, routes in consideration of overlapping of nodes, pipelines, and links and operation rate are selected based on information about the start and end nodes of each of redundant routes.Type: GrantFiled: September 14, 2017Date of Patent: March 10, 2020Assignee: Nippon Telegraph And Telephone CorporationInventors: Akihiro Kadohata, Akira Hirano, Atsushi Watanabe, Fumikazu Inuzuka, Takafumi Tanaka
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Publication number: 20180006889Abstract: Accommodation design for wavelength and sub-? paths in a communication network is performed. If sub-? path accommodation is possible according to search for a wavelength path present in a single-hop logical route, the accommodation in the wavelength path is executed. If sub-? path accommodation is possible according to search for a wavelength path present in a multi-hop logical route, a logical route is selected based on the wavelength path and the sub-? path is accommodated in the wavelength path. Additionally, each physical route suitable for the sub-? path accommodation is searched for. If the route can accommodate a wavelength path set in a single-hop logical route by available wavelength allocation, the sub-? path is accommodated in the wavelength path. Furthermore, routes in consideration of overlapping of nodes, pipelines, and links and operation rate are selected based on information about the start and end nodes of each of redundant routes.Type: ApplicationFiled: September 14, 2017Publication date: January 4, 2018Inventors: Akihiro KADOHATA, Akira HIRANO, Atsushi WATANABE, Fumikazu INUZUKA, Takafumi TANAKA
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Patent number: 9794123Abstract: Accommodation design for wavelength and sub-? paths in a communication network is performed. If sub-? path accommodation is possible according to search for a wavelength path present in a single-hop logical route, the accommodation in the wavelength path is executed. If sub-? path accommodation is possible according to search for a wavelength path present in a multi-hop logical route, a logical route is selected based on the wavelength path and the sub-? path is accommodated in the wavelength path. Additionally, each physical route suitable for the sub-? path accommodation is searched for. If the route can accommodate a wavelength path set in a single-hop logical route by available wavelength allocation, the sub-? path is accommodated in the wavelength path. Furthermore, routes in consideration of overlapping of nodes, pipelines, and links and operation rate are selected based on information about the start and end nodes of each of redundant routes.Type: GrantFiled: January 31, 2014Date of Patent: October 17, 2017Assignee: Nippon Telegraph And Telephone CorporationInventors: Akihiro Kadohata, Akira Hirano, Atsushi Watanabe, Fumikazu Inuzuka, Takafumi Tanaka
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Patent number: 9336080Abstract: A transmission system includes: an error correction encoding agent which converts an input data sequence into an encoded data sequence constituted of an error correction code and coded data; a data distribution agent which divides the encoded data sequence from the error correction encoding agent, in a predetermined processing unit and send them to a plurality of transmission routes; a data combining agent which combines signal sequences from the respective transmission routes and restores the encoded data sequence; an error correction decoding agent which applies error correction to and decodes the encoded data sequence from the data combining agent and outputs the input data sequence; and an agent for configuration in which a redundancy in the error correction encoding agent and a degree of splitting of the encoded data sequence in the data distribution agent are set.Type: GrantFiled: July 4, 2012Date of Patent: May 10, 2016Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira Hirano, Mitsunori Fukutoku, Yoshiaki Kisaka, Yoshiaki Sone, Akihiro Kadohata, Takafumi Tanaka
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Publication number: 20150350025Abstract: Accommodation design for wavelength and sub-? paths in a communication network is performed. If sub-? path accommodation is possible according to search for a wavelength path present in a single-hop logical route, the accommodation in the wavelength path is executed. If sub-? path accommodation is possible according to search for a wavelength path present in a multi-hop logical route, a logical route is selected based on the wavelength path and the sub-? path is accommodated in the wavelength path. Additionally, each physical route suitable for the sub-? path accommodation is searched for. If the route can accommodate a wavelength path set in a single-hop logical route by available wavelength allocation, the sub-? path is accommodated in the wavelength path. Furthermore, routes in consideration of overlapping of nodes, pipelines, and links and operation rate are selected based on information about the start and end nodes of each of redundant routes.Type: ApplicationFiled: January 31, 2014Publication date: December 3, 2015Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akihiro KADOHATA, Akira HIRANO, Atsushi WATANABE, Fumikazu INUZUKA, Takafumi TANAKA
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Patent number: 9178645Abstract: A wavelength path reallocation method in a path reallocation apparatus for reallocating a wavelength path set in a communication network, including: a wavelength path designing step in which a wavelength path designing unit designs a reallocation destination wavelength path by performing calculation such that the number of use frequency regions in the communication network becomes smaller than a corresponding value before reallocation; and a wavelength path setting step in which a wavelength path setting unit changes a reallocation target wavelength path to the reallocation destination wavelength path by using free wavelength.Type: GrantFiled: October 21, 2011Date of Patent: November 3, 2015Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akihiro Kadohata, Akira Hirano, Yoshiaki Sone, Yukio Tsukishima, Takafumi Tanaka
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Patent number: 9154257Abstract: A frequency assignment method for selecting a frequency width used on a route connecting between a start point and an end point when the start point and the end point of an optical signal are supplied in a photonic network including an optical node that includes an optical switch for switching the optical signal without electrically terminating the optical signal is disclosed. The frequency assignment method includes steps of: obtaining a correlation amount of use state of wavelength or frequency between adjacent links by referring to a route calculation result; determining a fixed frequency width or variable frequency width to be set for a communication route based on the correlation amount; and assigning the fixed frequency width or the variable frequency width on the route.Type: GrantFiled: October 24, 2011Date of Patent: October 6, 2015Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira Hirano, Yoshiaki Sone, Akihiro Kadohata, Takafumi Tanaka, Shinji Matsuoka
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Publication number: 20140108894Abstract: A transmission system comprising: an error correction encoding agent which converts an input data sequence into a coded data sequence constituted of an error correction code and coded data; a data distribution agent which divides encoded data sequence from the error correction encoding agent, in a predetermined processing unit and combines the divided data sequences with a plurality of transmission routes; a data combining agent which combines signal sequences from the respective transmission routes and decodes encoded data sequence; an error correction decoding agent which applies error correction to and decodes encoded data sequence from the data combining agent and outputs the input data sequence; and an agent for configuration in which a redundancy in the error correction encoding agent and a degree of splitting of encoded data sequence in the data distribution agent are set.Type: ApplicationFiled: July 4, 2012Publication date: April 17, 2014Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira Hirano, Mitsunori Fukutoku, Yoshiaki Kisaka, Yoshiaki Sone, Akihiro Kadohata, Takafumi Tanaka
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Publication number: 20130216226Abstract: A frequency assignment method for selecting a frequency width used on a route connecting between a start point and an end point when the start point and the end point of an optical signal are supplied in a photonic network including an optical node that includes an optical switch for switching the optical signal without electrically terminating the optical signal is disclosed. The frequency assignment method includes steps of: obtaining a correlation amount of use state of wavelength or frequency between adjacent links by referring to a route calculation result; determining a fixed frequency width or variable frequency width to be set for a communication route based on the correlation amount; and assigning the fixed frequency width or the variable frequency width on the route.Type: ApplicationFiled: October 24, 2011Publication date: August 22, 2013Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira Hirano, Yoshiaki Sone, Akihiro Kadohata, Takafumi Tanaka, Shinji Matsuoka
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Publication number: 20130195460Abstract: A wavelength path reallocation method in a path reallocation apparatus for reallocating a wavelength path set in a communication network, including: a wavelength path designing step in which a wavelength path designing unit designs a reallocation destination wavelength path by performing calculation such that the number of use frequency regions in the communication network becomes smaller than a corresponding value before reallocation; and a wavelength path setting step in which a wavelength path setting unit changes a reallocation target wavelength path to the reallocation destination wavelength path by using free wavelength.Type: ApplicationFiled: October 21, 2011Publication date: August 1, 2013Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akihiro Kadohata, Akira Hirano, Yoshiaki Sone, Yukio Tsukishima, Takafumi Tanaka