Patents by Inventor Shigeo Urushidani
Shigeo Urushidani 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: 8897306Abstract: The path management controller 1 refers to resource information 131 including reservation statuses of working paths and advance reserved paths that are set in every link, so as to calculate a route for setting a new path and set this path in this calculated route. If the route for setting this new path cannot be obtained (1) because of a shortage of residual bandwidth of a link of interest, the path management controller 1 refers to the resource reservation information 131 of working paths and advance reserved paths and calculates an alternative route for another existing path used in the link of interest, and moves this path to the calculated alternative route.Type: GrantFiled: August 21, 2008Date of Patent: November 25, 2014Assignees: Nippon Telegraph and Telephone Corporation, Inter-University Research Institute Corporation Research Organization of Information and SystemsInventors: Rie Hayashi, Kaori Shimizu, Ichiro Inoue, Shigeo Urushidani
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Patent number: 8532087Abstract: An optical network has: sections for establishing optical paths; a plurality of optical edge routers for connecting external IP networks to the optical network (1001); and a plurality of optical cross connects, for connecting the optical edge routers by the optical paths, having switching sections with respect to an optical pulse unit. In the optical network, each of the optical edge routers has both of: (1) an optical network control instance (INSp) for maintaining topology information in the optical network and switching/signaling the optical paths; and (2) an IP network instance (INSi) for maintaining a routing table in each of the external IP networks and activating routing protocols between the external IP networks and the IP network instance. By doing this, it is possible to realize a multi-layer cooperative function and provide highly safe optical networks, etc.Type: GrantFiled: February 2, 2004Date of Patent: September 10, 2013Assignee: Nippon Telegraph and Telephone CorporationInventors: Hisashi Kojima, Takashi Kurimoto, Ichiro Inoue, Tomonori Takeda, Takashi Miyamura, Keisuke Kabashima, Nobuaki Matsuura, Michihiro Aoki, Shigeo Urushidani
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Patent number: 8422360Abstract: A route switching method for switching a route in a core network that accommodates service networks including user node apparatuses by use of a server storing path information that includes, in every time frame, a route for a working path and a route for a backup path to be switched over from the working path, both of the working path and the backup path established between two boundary node apparatuses each of which is located on a boundary between the service network and the core network. The server calculates, in response to the connection request from the user node apparatus, a route for a working path and a route for a backup path, and requests the boundary node apparatus to establish this working path. The server can send the route for the backup path to the boundary node apparatus before a failure occurs in the core network.Type: GrantFiled: June 30, 2009Date of Patent: April 16, 2013Assignees: Nippon Telegraph and Telephone Corporation, Inter-University Research Institute Corporation Research Organization of Information and SystemsInventors: Kaori Shimizu, Ichiro Inoue, Kohei Shiomoto, Shigeo Urushidani
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Publication number: 20110292949Abstract: The path management controller 1 refers to resource information 131 including reservation statuses of working paths and advance reserved paths that are set in every link, so as to calculate a route for setting a new path and set this path in this calculated route. If the route for setting this new path cannot be obtained (1) because of a shortage of residual bandwidth of a link of interest, the path management controller 1 refers to the resource reservation information 131 of working paths and advance reserved paths and calculates an alternative route for another existing path used in the link of interest, and moves this path to the calculated alternative route.Type: ApplicationFiled: August 21, 2008Publication date: December 1, 2011Applicants: Inter-University Research Institute Corporation Research, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Rie Hayashi, Kaori Shimizu, Ichiro Inoue, Shigeo Urushidani
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Publication number: 20110090785Abstract: A route switching method for switching a route in a core network that accommodates service networks including user node apparatuses by use of a server storing path information that includes, in every time frame, a route for a working path and a route for a backup path to be switched over from the working path, both of the working path and the backup path established between two boundary node apparatuses each of which is located on a boundary between the service network and the core network. The server calculates, in response to the connection request from the user node apparatus, a route for a working path and a route for a backup path, and requests the boundary node apparatus to establish this working path. The server can send the route for the backup path to the boundary node apparatus before a failure occurs in the core network.Type: ApplicationFiled: June 30, 2009Publication date: April 21, 2011Applicants: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, INTER-UNIVERSITY RESEARCH INST CORPORATION RESEARCH ORGANIZATION OF INFORMATION AND SYSTEMSInventors: Kaori Shimizu, Ichiro Inoue, Kohei Shiomoto, Shigeo Urushidani
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Patent number: 7797444Abstract: A data transfer apparatus and a data transfer system are provided that can reduce the cost of installing communication equipment compatible with each of several dissimilar communication protocols in one exchange office and can reduce the cost of constructing the network.Type: GrantFiled: February 2, 2004Date of Patent: September 14, 2010Assignee: Nippon Telegraph and Telephone CorporationInventors: Keisuke Kabashima, Michihiro Aoki, Takashi Kurimoto, Takashi Miyamura, Masahiro Goshima, Nobuaki Matsuura, Shigeo Urushidani
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Publication number: 20060168316Abstract: A data transfer apparatus and a data transfer system are provided that can reduce the cost of installing communication equipment compatible with each of several dissimilar communication protocols in one exchange office and can reduce the cost of constructing the network.Type: ApplicationFiled: February 2, 2004Publication date: July 27, 2006Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Keisuke Kabashima, Michihiro Aoki, Takashi Kurimoto, Takashi Miyamura, Masahiro Goshima, Nobuaki Matsuura, Shigeo Urushidani
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Publication number: 20060126642Abstract: An optical network has: sections for establishing optical paths; a plurality of optical edge routers for connecting external IP networks to the optical network (1001); and a plurality of optical cross connects, for connecting the optical edge routers by the optical paths, having switching sections with respect to an optical pulse unit. In the optical network, each of the optical edge routers has both of: (1) an optical network control instance (INSp) for maintaining topology information in the optical network and switching/signaling the optical paths; and (2) an IP network instance (INSi) for maintaining a routing table in each of the external IP networks and activating routing protocols between the external IP networks and the IP network instance. By doing this, it is possible to realize a multi-layer cooperative function and provide highly safe optical networks, etc.Type: ApplicationFiled: February 2, 2004Publication date: June 15, 2006Applicant: NIPPON TELEGRAPH AND TELEPHONEInventors: Hisashi Kojima, Takshi Kurimoto, Ichiro Inoue, Tomonori Takeda, Takashi Miyamura, Kaisuke Kabashima, Nobuaki Matsuura, Michihiro Aoki, Shigeo Urushidani
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Patent number: 5287316Abstract: A FIFO buffer in which respective portions are controlled in a distributed manner is provided. In the FIFO buffer, a number of loop circuits having delay elements are provided in which respective loop circuits are connected to one another in cascade manner. Additionally provided are a number of traffic control units for controlling the signal traffic between respective neighboring loop circuits. In the case where no signal is fed back to a traffic control unit from the output side and also a new signal is transmitted thereto from the input side, the traffic control unit transmits the new signal to the loop circuit which is on the output side. In the case where any signal is fed back to a traffic control unit from the output side and also a new signal is transmitted thereto from the input side, the traffic control unit again transmits the fed-back signal to the loop circuit which is on the output side and transmits the new signal to the loop circuit which is on the input side.Type: GrantFiled: May 24, 1991Date of Patent: February 15, 1994Assignee: Nippon Telegraph and Telephone CorporationInventors: Shigeo Urushidani, Koji Sasayama, Jun Nishikido
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Patent number: 5022025Abstract: A self-routing switch in which a plurality of switching stages, each having a plurality of switching elements, are sequentially connected by substitute links, wherein additional two input terminals and additional two output terminals are provided in each switching element of at least the last plural switching stages of the switch, and the output terminals and input terminals of the same line position between these last plural switching stages are connected by equivalent links, respectively. When information data appended with a destination address and judge times, as routing information, is input into the switch, one of the bits in the destination address is selected as a judge bit on the basis of the judge times, and the output terminal to which the information data is to be output is selected according to the value of the judge bit.Type: GrantFiled: February 13, 1989Date of Patent: June 4, 1991Assignee: Nippon Telegraph and Telephone CorporationInventors: Shigeo Urushidani, Hitoshi Imagawa
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Patent number: 4864558Abstract: In a self-routing switch which comprises a plurality of switching stages inserted between pluralities of input and output lines and cascade-connected by pluralities of input and output links, each switching stage includes a plurality of cascade-connected store/switch elements. Each store/switch element of each switching stage outputs an information data input thereto from the corresponding input link to the corresponding output link or shifts the input information data through a predetermined number of cascade-connected elements and outputs it to the corresponding output link, in accordance with a portion of routing information contained in the input information data, which portion corresponds to the switching stage.Type: GrantFiled: November 17, 1987Date of Patent: September 5, 1989Assignee: Nippon Telegraph and Telephone CorporationInventors: Hitoshi Imagawa, Shigeo Urushidani, Koichi Hagishima