Patents by Inventor Tomonari Kagimoto
Tomonari Kagimoto 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: 9693270Abstract: A control device includes: a memory; and a processor coupled to the memory and configured to: acquire congestion information indicating a congestion state of communication of wireless local area networks (LANs) which are connection destination candidates of a mobile terminal configured to switch a state thereof between a first state and a second state, in the first state the mobile terminal being wirelessly connected to a radio base station of a mobile communication network and not performing a detection operation of a wireless LAN among the wireless LANs, and in the second state the mobile terminal performing the detection operation and being wirelessly connected to a detected wireless LAN, and perform switching control for switching a state of the mobile terminal from the first state to the second state when the congestion information satisfies a given condition.Type: GrantFiled: June 19, 2014Date of Patent: June 27, 2017Assignee: FUJITSU LIMITEDInventors: Xiang Du, Tomonari Kagimoto, Tatsuya Yatsushiro, Yasushi Shigesada, Junji Satou, Tomohide Yamamoto
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Publication number: 20150009822Abstract: A control device includes: a memory; and a processor coupled to the memory and configured to: acquire congestion information indicating a congestion state of communication of wireless local area networks (LANs) which are connection destination candidates of a mobile terminal configured to switch a state thereof between a first state and a second state, in the first state the mobile terminal being wirelessly connected to a radio base station of a mobile communication network and not performing a detection operation of a wireless LAN among the wireless LANs, and in the second state the mobile terminal performing the detection operation and being wirelessly connected to a detected wireless LAN, and perform switching control for switching a state of the mobile terminal from the first state to the second state when the congestion information satisfies a given condition.Type: ApplicationFiled: June 19, 2014Publication date: January 8, 2015Inventors: Xiang DU, Tomonari KAGIMOTO, Tatsuya YATSUSHIRO, Yasushi SHIGESADA, Junji SATOU, Tomohide YAMAMOTO
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Patent number: 8422433Abstract: A base station apparatus includes a determining unit that determines whether a direct link has been established between the base station apparatus and another base station apparatus, when a mobile device makes a request to switch a communication recipient from the base station apparatus to the other base station apparatus; a link information acquiring unit that acquires, indirectly from the other base station apparatus, link information necessary for establishing the direct link to the other base station apparatus, when the determining unit determines that no direct link to the other base station apparatus has been established; and a link requesting unit that requests the other base station apparatus to establish the direct link to the base station apparatus, based on the link information of the other base station apparatus acquired by the link information acquiring unit.Type: GrantFiled: March 15, 2012Date of Patent: April 16, 2013Assignee: Fujitsu LimitedInventors: Tomonari Kagimoto, Tatsuhiko Takata, Yohji Fukuzawa, Akihiro Sato
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Patent number: 8359035Abstract: A wireless base station includes a candidate-cell obtaining unit that obtains a plurality of wireless communication route candidates usable for wireless communication of a mobile station with wireless base stations; a candidate-cell extracting unit that determines whether a wireless communication route candidate via which wireless communication can be performed is included in a plurality of wireless communication route candidates managed by the wireless base station itself from among the obtained wireless communication route candidates; a self-station determining unit; and a handover preparing unit that, when wireless communication can be performed via at least any of the wireless communication route candidates managed by the wireless base station itself according to the result of determination, notifies a wireless base station with which the mobile station is in wireless communication that wireless communication can be performed with the mobile station.Type: GrantFiled: April 29, 2009Date of Patent: January 22, 2013Assignee: Fujitsu LimitedInventors: Yohji Fukuzawa, Akihiro Sato, Tomonari Kagimoto, Hiroshi Ohiwane, Satoshi Ushiroda
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Patent number: 8320917Abstract: A communication method in a communication system, wherein the communication system includes a mobile terminal, a communication server that distributes data to the mobile terminal, and plural base stations that are capable of relaying the data, and one of the base stations among the plural base stations is responsible for relaying the data. The communication method includes transmitting, to the communication server, restriction instruction information to restrict a data transmission rate, by a first base station that is responsible for relaying the data among the plural base stations, and hand-overing, by the first base station, causing a second base station different from the first base station to take over the responsibility of relaying.Type: GrantFiled: June 10, 2010Date of Patent: November 27, 2012Assignee: Fujitsu LimitedInventors: Tomonari Kagimoto, Yohji Fukuzawa, Akihiro Sato, Tatsuhiko Takata, Kazunori Umezaki
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Publication number: 20120177007Abstract: A base station apparatus includes a determining unit that determines whether a direct link has been established between the base station apparatus and another base station apparatus, when a mobile device makes a request to switch a communication recipient from the base station apparatus to the other base station apparatus; a link information acquiring unit that acquires, indirectly from the other base station apparatus, link information necessary for establishing the direct link to the other base station apparatus, when the determining unit determines that no direct link to the other base station apparatus has been established; and a link requesting unit that requests the other base station apparatus to establish the direct link to the base station apparatus, based on the link information of the other base station apparatus acquired by the link information acquiring unit.Type: ApplicationFiled: March 15, 2012Publication date: July 12, 2012Applicant: FUJITSU LIMITEDInventors: Tomonari Kagimoto, Tatsuhiko Takata, Yohji Fukuzawa, Akihiro Sato
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Patent number: 8169971Abstract: A base station apparatus includes a determining unit that determines whether a direct link has been established between the base station apparatus and another base station apparatus, when a mobile device makes a request to switch a communication recipient from the base station apparatus to the other base station apparatus; a link information acquiring unit that acquires, indirectly from the other base station apparatus, link information necessary for establishing the direct link to the other base station apparatus, when the determining unit determines that no direct link to the other base station apparatus has been established; and a link requesting unit that requests the other base station apparatus to establish the direct link to the base station apparatus, based on the link information of the other base station apparatus acquired by the link information acquiring unit.Type: GrantFiled: June 8, 2009Date of Patent: May 1, 2012Assignee: Fujitsu LimitedInventors: Tomonari Kagimoto, Tatsuhiko Takata, Yohji Fukuzawa, Akihiro Sato
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Patent number: 7991404Abstract: A congestion control method in a mobile communication network includes the steps of recognizing by a base station control unit of the mobile communication network that the base station control unit or a base station or a cell under the same becomes in a congestion state (Yes in #11), determining a destination for a mobile terminal under a cell in the congestion state to get rid of the congestion state (#12), and sending a notice of information of the destination together with congestion information that is information of the congestion state, based on control performed by the base station control unit, to the base station control unit or the base station under the same in the congestion state or a mobile terminal that is located in the cell under the base station control unit, so that a user of the mobile terminal can recognize the congestion state (#13 and #14).Type: GrantFiled: September 26, 2007Date of Patent: August 2, 2011Assignee: Fujitsu LimitedInventors: Tomonari Kagimoto, Hitoshi Ebihara, Wataru Kawaguchi, Kusuo Yonezawa, Koichi Yamamoto
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Publication number: 20110014937Abstract: A communication control system includes a wireless base station A and a wireless base station B that control wireless communication of a mobile communication terminal and an EPC that performs path control and data transmission/reception control between the wireless base station A and the wireless base station B by wire communication. Then, when the wireless base station B receives a handover request requesting for switching the wireless path from the mobile communication terminal, the wireless base station B switches the wireless path to a wireless path through the wireless base station B, and after a predetermined time elapses from when the wireless path is switched, the wireless base station B transmits a request for switching a wire path through the wireless base station A that performs data transmission/reception control for the mobile communication terminal to a wire path through the wireless base station B to the EPC.Type: ApplicationFiled: September 27, 2010Publication date: January 20, 2011Applicant: FUJITSU LIMITEDInventors: Tatsuhiko TAKATA, Yohji FUKUZAWA, Akihiro SATOU, Tomonari KAGIMOTO
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Publication number: 20100248726Abstract: A communication method in a communication system, wherein the communication system includes a mobile terminal, a communication server that distributes data to the mobile terminal, and plural base stations that are capable of relaying the data, and one of the base stations among the plural base stations is responsible for relaying the data. The communication method includes transmitting, to the communication server, restriction instruction information to restrict a data transmission rate, by a first base station that is responsible for relaying the data among the plural base stations, and hand-overing, by the first base station, causing a second base station different from the first base station to take over the responsibility of relaying.Type: ApplicationFiled: June 10, 2010Publication date: September 30, 2010Applicant: FUJITSU LIMITEDInventors: Tomonari KAGIMOTO, Yohji FUKUZAWA, Akihiro SATO, Tatsuhiko TAKATA, Kazunori UMEZAKI
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Publication number: 20100067484Abstract: A base station apparatus includes a determining unit that determines whether a direct link has been established between the base station apparatus and another base station apparatus, when a mobile device makes a request to switch a communication recipient from the base station apparatus to the other base station apparatus; a link information acquiring unit that acquires, indirectly from the other base station apparatus, link information necessary for establishing the direct link to the other base station apparatus, when the determining unit determines that no direct link to the other base station apparatus has been established; and a link requesting unit that requests the other base station apparatus to establish the direct link to the base station apparatus, based on the link information of the other base station apparatus acquired by the link information acquiring unit.Type: ApplicationFiled: June 8, 2009Publication date: March 18, 2010Applicant: FUJITSU LIMITEDInventors: Tomonari Kagimoto, Tatsuhiko Takata, Yohji Fukuzawa, Akihiro Sato
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Publication number: 20090318155Abstract: A wireless base station includes a candidate-cell obtaining unit that obtains a plurality of wireless communication route candidates usable for wireless communication of a mobile station with wireless base stations; a candidate-cell extracting unit that determines whether a wireless communication route candidate via which wireless communication can be performed is included in a plurality of wireless communication route candidates managed by the wireless base station itself from among the obtained wireless communication route candidates; a self-station determining unit; and a handover preparing unit that, when wireless communication can be performed via at least any of the wireless communication route candidates managed by the wireless base station itself according to the result of determination, notifies a wireless base station with which the mobile station is in wireless communication that wireless communication can be performed with the mobile station.Type: ApplicationFiled: April 29, 2009Publication date: December 24, 2009Applicant: FUJITSU LIMITEDInventors: Yohji FUKUZAWA, Akihiro SATO, Tomonari KAGIMOTO, Hiroshi OHIWANE, Satoshi USHIRODA
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Publication number: 20080102853Abstract: A congestion control method in a mobile communication network includes the steps of recognizing by a base station control unit of the mobile communication network that the base station control unit or a base station or a cell under the same becomes in a congestion state (Yes in #11), determining a destination for a mobile terminal under a cell in the congestion state to get rid of the congestion state (#12), and sending a notice of information of the destination together with congestion information that is information of the congestion state, based on control performed by the base station control unit, to the base station control unit or the base station under the same in the congestion state or a mobile terminal that is located in the cell under the base station control unit, so that a user of the mobile terminal can recognize the congestion state (#13 and #14).Type: ApplicationFiled: September 26, 2007Publication date: May 1, 2008Inventors: Tomonari Kagimoto, Hitoshi Ebihara, Wataru Kawaguchi, Kusuo Yonezawa, Koichi Yamamoto