Patents by Inventor Toshiaki Takao
Toshiaki Takao 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: 7955673Abstract: The present invention provides a PVD cylindrical target comprising an evaporation material covering the outer circumferential surface of a cylindrical substrate, the PVD cylindrical target includes a meshing part having at least either of a protruding shape and a recessed shape formed with rounded angular parts at the interface between the substrate and the evaporation material. According to such a structure, peeling or cracking of the evaporation material by a residual stress caused at the interface between the substrate and the evaporation material by a thermal expansion difference between the both can be suppressed, and sufficient adhesiveness between the both can also be ensured.Type: GrantFiled: May 30, 2007Date of Patent: June 7, 2011Assignee: Kobe Steel, Ltd.Inventors: Toshiaki Takao, Takahiro Okazaki, Hirofumi Fujii
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Patent number: 7502596Abstract: A mobile communication system includes a base station connected to a backbone network, and a mobile station configured to communicate with the base station using a radio frequency. The system has a first communication mode, in which a first radio frequency is used for an uplink and a second radio frequency is used for a downlink; a second communication mode, in which the first radio frequency is used for the uplink, and the second radio frequency is shared by the uplink and the downlink; a third communication mode, in which the second radio frequency is used for the downlink, and the first radio frequency is shared by the uplink and the downlink; and a mode switcher configured to switch the first through third communication modes in accordance with data transfer volumes on the uplink and the downlink.Type: GrantFiled: May 14, 2002Date of Patent: March 10, 2009Assignee: NTT DoCoMo, Inc.Inventors: Toshiaki Takao, Narumi Umeda, Lan Chen
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Publication number: 20080003385Abstract: The present invention provides a PVD cylindrical target comprising an evaporation material covering the outer circumferential surface of a cylindrical substrate, the PVD cylindrical target includes a meshing part having at least either of a protruding shape and a recessed shape formed with rounded angular parts at the interface between the substrate and the evaporation material. According to such a structure, peeling or cracking of the evaporation material by a residual stress caused at the interface between the substrate and the evaporation material by a thermal expansion difference between the both can be suppressed, and sufficient adhesiveness between the both can also be ensured.Type: ApplicationFiled: May 30, 2007Publication date: January 3, 2008Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.)Inventors: Toshiaki Takao, Takahiro Okazaki, Hirofumi Fujii
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Patent number: 7254132Abstract: In a wireless base station, when a newly provided control unit receives an IP packet from one mobile station (102), it refers to a destination address in control information added to the IP packet (104), and determines whether the IP packet is one to be broadcast or multicast (106). If the value of destination address is at a value indicative of broadcasting or the like defined by IP, the IP packet is copied according to the subnet, and is sent back to a wireless link layer processor with its contents intact (108). Further, the wireless link layer processor is commanded to broadcast the sent-back IP packet in a wireless area and so forth (110), whereby the IP packet can be broadcast into a cell and so forth.Type: GrantFiled: May 1, 2002Date of Patent: August 7, 2007Assignee: NTT DoCoMo, Inc.Inventors: Toshiaki Takao, Kobaruto Shimada, Narumi Umeda, Hijin Sato
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Patent number: 7254409Abstract: The present invention is configured such that, in a multicast service providing system in which multicast information distribution service is made from an information distributing apparatus to radio terminals present within a service area via a radio section, the radio terminal has service continuation request signal transmitting a service continuation request signal for requesting continuation of the multicast information distribution service to the information distributing apparatus, the information distributing apparatus has service continuation management means managing as to whether or not request for the service continuation has been made by the radio terminal for the multicast information distribution service, and the information distributing apparatus transmits information indicating as to whether or not continuation request has been made for the multicast information distribution service managed by the service continuation management means.Type: GrantFiled: April 12, 2001Date of Patent: August 7, 2007Assignee: NTT DoCoMo, Inc.Inventors: Hijin Sato, Kobaruto Shimada, Toshiaki Takao, Narumi Umeda
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Publication number: 20070162810Abstract: In a retransmission control method for a multicast information distribution service, when information which requires retransmission is generated, a wireless terminal transmits the retransmission request for the information to an information distribution apparatus when a timing determined for the wireless terminal is reached. The information distribution apparatus which receives the retransmission request transmits retransmission information which indicates the information requested by the retransmission request, with respect to each of the wireless terminals within the service area, and retransmits the information requested by the retransmission request at a predetermined timing.Type: ApplicationFiled: March 5, 2007Publication date: July 12, 2007Applicant: NTT DoCoMo, Inc.Inventors: Hijin SATO, Kobaruto Shimada, Toshiaki Takao, Narumi Umeda
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Patent number: 7184784Abstract: The present invention is configured such that, in a multicast service providing system in which multicast information distribution service is made from an information distributing apparatus to radio terminals present within a service area via a radio section, the radio terminal has service continuation request signal transmitting a service continuation request signal for requesting continuation of the multicast information distribution service to the information distributing apparatus, the information distributing apparatus has service continuation management means managing as to whether or not request for the service continuation has been made by the radio terminal for the multicast information distribution service, and the information distributing apparatus transmits information indicating as to whether or not continuation request has been made for the multicast information distribution service managed by the service continuation management means.Type: GrantFiled: April 12, 2001Date of Patent: February 27, 2007Assignee: NTT DoCoMo, Inc.Inventors: Hijin Sato, Kobaruto Shimada, Toshiaki Takao, Narumi Umeda
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Patent number: 7136662Abstract: One preferred embodiment of the invention provides a wireless base station which provides a multicasting service to simultaneously transmit identical data to a plurality of wireless terminals. A wireless base station is connected to a plurality of wireless terminals and provides a multicasting service for a plurality of wireless terminals. The wireless base station determines autonomously whether it provides the multicasting service for the plurality of wireless terminals. Another preferred embodiment of the invention provides a method of selecting a wireless base station for a wireless terminal, the wireless base station providing a multicasting service for the wireless terminal. When the wireless terminal can receive the same multicasting information from a plurality of wireless base stations, the wireless terminal selects one of the plurality of wireless base stations so as to make the number of the wireless base stations that send the same multicasting information as small as possible.Type: GrantFiled: February 2, 2001Date of Patent: November 14, 2006Assignee: NTT DoCoMo, Inc.Inventors: Hijin Sato, Narumi Umeda, Toshiaki Takao, Kobaruto Shimada
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Publication number: 20060160549Abstract: One preferred embodiment of the invention provides a wireless base station which provides a multicasting service to simultaneously transmit identical data to a plurality of wireless terminals. A wireless base station is connected to a plurality of wireless terminals and provides a multicasting service for a plurality of wireless terminals. The wireless base station determines autonomously whether it provides the multicasting service for the plurality of wireless terminals. Another preferred embodiment of the invention provides a method of selecting a wireless base station for a wireless terminal, the wireless base station providing a multicasting service for the wireless terminal. When the wireless terminal can receive the same multicasting information from a plurality of wireless base stations, the wireless terminal selects one of the plurality of wireless base stations so as to make the number of the wireless base stations that send the same multicasting information as small as possible.Type: ApplicationFiled: March 14, 2006Publication date: July 20, 2006Applicant: NTT DoCoMo, Inc.Inventors: Hijin Sato, Narumi Umeda, Toshiaki Takao, Kobaruto Shimada
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Patent number: 6871071Abstract: In handover control methods and systems which switch a radio base station serving as a communicating counterpart of a mobile station, the present invention provides a handover control method and a system thereof wherein a detection is made when a communication while a predetermined minimum bandwidth secured is not possible at any mobile station communicating with the radio base station and upon the detection the communicating counterpart of the mobile station that communicates with the radio base station mentioned above is switched from the radio base station to other radio base stations.Type: GrantFiled: December 27, 2000Date of Patent: March 22, 2005Assignee: NTT DoCoMo, Inc.Inventors: Toshiaki Takao, Hijin Sato, Narumi Umeda
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Publication number: 20030157966Abstract: One preferred embodiment of the invention provides a wireless base station which provides a multicasting service to simultaneously transmit identical data to a plurality of wireless terminals. A wireless base station is connected to a plurality of wireless terminals and provides a multicasting service for a plurality of wireless terminals. The wireless base station determines autonomously whether it provides the multicasting service for the plurality of wireless terminals. Another preferred embodiment of the invention provides a method of selecting a wireless base station for a wireless terminal, the wireless base station providing a multicasting service for the wireless terminal. When the wireless terminal can receive the same multicasting information from a plurality of wireless base stations, the wireless terminal selects one of the plurality of wireless base stations so as to make the number of the wireless base stations that send the same multicasting information as small as possible.Type: ApplicationFiled: January 29, 2002Publication date: August 21, 2003Inventors: Hijin Sato, Narumi Umeda, Toshiaki Takao, Kobaruto Shimada
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Publication number: 20020173277Abstract: A mobile communication system includes a base station connected to a backbone network, and a mobile station configured to communicate with the base station using a radio frequency. The system has a first communication mode, in which a first radio frequency is used for an uplink and a second radio frequency is used for a downlink; a second communication mode, in which the first radio frequency is used for the uplink, and the second radio frequency is shared by the uplink and the downlink; a third communication mode, in which the second radio frequency is used for the downlink, and the first radio frequency is shared by the uplink and the downlink; and a mode switcher configured to switch the first through third communication modes in accordance with data transfer volumes on the uplink and the downlink.Type: ApplicationFiled: May 14, 2002Publication date: November 21, 2002Applicant: NTT DoCoMo, Inc.Inventors: Toshiaki Takao, Narumi Umeda, Lan Chen
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Publication number: 20020163902Abstract: In a wireless base station, when a newly provided control unit receives an IP packet from one mobile station (102), it refers to a destination address in control information added to the IP packet (104), and determines whether the IP packet is one to be broadcast or multicast (106). If the value of destination address is at a value indicative of broadcasting or the like defined by IP, the IP packet is copied according to the subnet, and is sent back to a wireless link layer processor with its contents intact (108). Further, the wireless link layer processor is commanded to broadcast the sent-back IP packet in a wireless area and so forth (110), whereby the IP packet can be broadcast into a cell and so forth.Type: ApplicationFiled: May 1, 2002Publication date: November 7, 2002Applicant: NTT DoCoMo, Inc.Inventors: Toshiaki Takao, Kobaruto Shimada, Narumi Umeda, Hijin Sato
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Publication number: 20020160777Abstract: In handover control methods and systems which switch a radio base station serving as a communicating counterpart of a mobile station, the present invention provides a handover control method and a system thereof wherein a detection is made when a communication while a predetermined minimum bandwidth secured is not possible at any mobile station communicating with the radio base station and upon the detection the communicating counterpart of the mobile station that communicates with the radio base station mentioned above is switched from the radio base station to other radio base stations.Type: ApplicationFiled: August 28, 2001Publication date: October 31, 2002Inventors: Toshiaki Takao, Hijin Sato, Narumi Umeda
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Publication number: 20020106985Abstract: The present invention is configured such that, in a multicast service providing system in which multicast information distribution service is made from an information distributing apparatus to radio terminals present within a service area via a radio section, the radio terminal has service continuation request signal transmitting a service continuation request signal for requesting continuation of the multicast information distribution service to the information distributing apparatus, the information distributing apparatus has service continuation management means managing as to whether or not request for the service continuation has been made by the radio terminal for the multicast information distribution service, and the information distributing apparatus transmits information indicating as to whether or not continuation request has been made for the multicast information distribution service managed by the service continuation management means.Type: ApplicationFiled: March 25, 2002Publication date: August 8, 2002Inventors: Hijin Sato, Kobaruto Shimada, Toshiaki Takao, Narumi Umeda
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Publication number: 20020028687Abstract: In a retransmission control method for a multicast information distribution service, when information which requires retransmission is generated, a wireless terminal transmits the retransmission request for the information to an information distribution apparatus when a timing determined for the wireless terminal is reached. The information distribution apparatus which receives the retransmission request transmits retransmission information which indicates the information requested by the retransmission request, with respect to each of the wireless terminals within the service area, and retransmits the information requested by the retransmission request at a predetermined timing.Type: ApplicationFiled: August 2, 2001Publication date: March 7, 2002Applicant: NTT DoCoMo, Inc.Inventors: Hijin Sato, Kobaruto Shimada, Toshiaki Takao, Narumi Umeda
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Patent number: 5920220Abstract: A clock timing recovery circuit for recovering the clock timing from a baseband signal obtained by detection of a received signal. The clock timing is rapidly established using a clock signal which has been phase-shifted from the desired clock timing to sample the baseband signal, and by obtaining the optimum phase from the sampled signal obtained as a result. A clock-timing recovery circuit according to this invention does not require oversampling and provides easy optimization of circuit constants.Type: GrantFiled: July 22, 1997Date of Patent: July 6, 1999Assignee: Nippon Telegraph and Telephone CorporationInventors: Toshiaki Takao, Yoshifumi Suzuki, Tadashi Shirato