Patents by Inventor Keijiro Take
Keijiro Take 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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Publication number: 20180368005Abstract: Provided is a beam transmission/reception method, which is executed in a wireless communication system in which a terminal and a base station use a beam to communicate to and from each other. The method includes a step of grouping, by the base station, when the base station is to receive a random access channel signal transmitted as a connection request from the terminal, a plurality of beam directions by combining a main beam direction, which is determined as suitable for reception of the random access channel signal, with one or more beam directions adjacent to the main beam direction, and of receiving the random access channel signal with use of the grouped plurality of beam directions.Type: ApplicationFiled: February 29, 2016Publication date: December 20, 2018Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Noriyuki FUKUI, Kazuaki ISHIOKA, Keijiro TAKE
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Publication number: 20180183511Abstract: A frequency-sharing radio communication system that includes a terrestrial radio communication system and a satellite communication system and in which a frequency band of a radio wave used by a terrestrial base station and a radio terminal of the terrestrial radio communication system overlaps with a frequency band of a beam radiated from a satellite of the satellite communication system, includes: a monitoring device that stores management information that associates a frequency used by the terrestrial base station, the usage state of the frequency, and a frequency of the beam radiated to an area where the terrestrial base station is located; and a managing device that selects, based on the management information, the terrestrial base station that shares a frequency with the beam and is located within an irradiation range of the beam, and instructs the selected terrestrial base station to stop using the shared frequency.Type: ApplicationFiled: January 21, 2015Publication date: June 28, 2018Applicant: Mitsubishi Electric CorporationInventors: Masao OGA, KEIJIRO TAKE
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Publication number: 20180014212Abstract: A satellite communication terminal according to the present invention includes a wired I/F unit to receive monitoring information from a mobile base station, which is a result of monitoring a device state of the mobile base station, a wireless I/F unit to perform radio communication with a satellite, a storage device to store therein monitoring-information processing policy information that indicates conditions for selecting the monitoring information to be transferred to the wireless I/F unit from among the monitoring information, and a monitoring-information processing unit to select the monitoring information to be transferred to the wireless I/F unit from among the monitoring information on a basis of the monitoring-information processing policy information, and to transfer the selected monitoring information to the wireless I/F unit.Type: ApplicationFiled: June 16, 2015Publication date: January 11, 2018Applicant: Mitsubishi Electric CorporationInventors: Masao OGA, Keijiro TAKE
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Publication number: 20170208524Abstract: A base station of a wireless communication system including a plurality of base stations and a control station that controls the base stations, the base station including an antenna unit that forms a transmission beam and a reception beam, a transmitting and receiving unit that measures, when other base stations determine that a terminal communicating with the other base stations around the own station needs to perform handover, signals transmitted to the other base stations by a handover target terminal which is the terminal determined to need to carry out the handover, and a control unit that notifies the control station of measurement results of the signals as information referred to when the control station determines a handover destination of the handover target terminal.Type: ApplicationFiled: May 27, 2015Publication date: July 20, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Noriyuki FUKUI, Keijiro TAKE
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Patent number: 8089932Abstract: When a mobile device performs a handover from a first wireless base station to a second wireless base station, a base station controller sends a control message addressed to the second base station to notify the handover, to the first wireless base station via a wired line. The first wireless base station sends received control message to the second wireless base station using a pre-established wireless line. The wireless base stations exchange a control message to control the second wireless base station, a control message to control the mobile device, and user data of the mobile device and a communication partner, using the wireless line.Type: GrantFiled: September 10, 2004Date of Patent: January 3, 2012Assignee: Mitsubishi Electric CorporationInventor: Keijiro Take
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Patent number: 7797002Abstract: In a radio access network in which a radio network controller is subjected to load distribution by a plurality of controllers, one of the controllers is set as a page controller that processes a paging message transmitted from a core network to the radio access network. When the paging control apparatus receives the paging message transmitted from the core network to the radio access network, the paging control apparatus judges a transmission destination of the paging message and transmits the paging message to the controllers that control a base station at the transmission destination.Type: GrantFiled: July 10, 2003Date of Patent: September 14, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7729318Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station from the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at a higher level of the candidate codes in the tree structure and being assignable to other mobile stations, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new staffing call message.Type: GrantFiled: March 12, 2009Date of Patent: June 1, 2010Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Publication number: 20090252113Abstract: A handover control server calculates a weight function of each peripheral cell of a cell to which a mobile device is currently connected, and notifies a cell list to the mobile device. The mobile device measures wireless-line qualities of peripheral cells registered in the cell list and the currently connected cell, calculates a peripheral-cell selection parameter of each cell based on a measured wireless-line quality, the cell list, weight function information, and a wireless-access capacity of the mobile device, and selects candidate cells of a handover destination based on a calculated peripheral-cell selection parameter.Type: ApplicationFiled: November 21, 2005Publication date: October 8, 2009Applicant: Mitsubishi Electric CorporationInventor: Keijiro Take
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Patent number: 7593371Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: September 19, 2006Date of Patent: September 22, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Publication number: 20090175256Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station from the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at a higher level of the candidate codes in the tree structure and being assignable to other mobile stations, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new staffing call message.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventor: KEIJIRO TAKE
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Publication number: 20080064403Abstract: When a mobile device preforms a handover from a first wireless base station to a second wireless base station, a base station controller sends a control message addressed to the second base station to notify the handover, to the first wireless base station via a wired line. The first wireless base station sends received control message to the second wireless base station using a pre-established wireless line. The wireless base stations exchange a control message to control the second wireless base station, a control message to control the mobile device, and user data of the mobile device and a communication partner, using the wireless line.Type: ApplicationFiled: September 10, 2004Publication date: March 13, 2008Inventor: Keijiro Take
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Publication number: 20070281715Abstract: In a radio access network in which a radio network controller is subjected to load distribution by a plurality of controllers, one of the controllers is set as a page controller that processes a paging message transmitted from a core network to the radio access network. When the paging control apparatus receives the paging message transmitted from the core network to the radio access network, the paging control apparatus judges a transmission destination of the paging message and transmits the paging message to the controllers that control a base station at the transmission destination.Type: ApplicationFiled: July 10, 2003Publication date: December 6, 2007Inventor: Keijiro Take
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Publication number: 20070008935Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: ApplicationFiled: September 19, 2006Publication date: January 11, 2007Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventor: Keijiro Take
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Patent number: 7149202Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: March 10, 2004Date of Patent: December 12, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7133389Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: March 10, 2004Date of Patent: November 7, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7126931Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station from the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at a higher level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new staffing call message.Type: GrantFiled: December 13, 2001Date of Patent: October 24, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7123602Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: March 10, 2004Date of Patent: October 17, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7120137Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: March 10, 2004Date of Patent: October 10, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 7110379Abstract: A base station controller selects codes corresponding to rate information included in a new starting call message from a mobile station, and further selects codes assignable to the mobile station out of the selected codes as candidate codes. Then, the base station controller detects codes which meet both the characteristics of being at upper level of the candidate codes in the tree structure and being assignable to other mobile station, and further detects levels of the detected codes. Detected levels for all the candidate codes are compared to find a candidate code whose level is the lowest and to assign the candidate code to the mobile station sending the new starting call message.Type: GrantFiled: March 10, 2004Date of Patent: September 19, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Keijiro Take
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Patent number: 6937858Abstract: A mobile radio communication system which does not need an omnidirectional channel for both a base station and a mobile station to track each other and uses only a narrow beam channel and can reduce a tracking time than before for an adjacent base station and a mobile station to search each other while a visiting area base station and the mobile station are communicating in the overlapped area. The base station and the mobile station comprise a unit for transmitting and receiving in forward or reverse channel, in different frequency, in different tracking channel using a narrow beam. Both the mobile station and the visiting area base station search the location each other, and after searched, they assign the frequency and the beam used in the tracking channel. At the same time, by comprising a searching slot in an information channel to search an adjacent base station while communicating with the visiting area base station, a tracking of other adjacent base station can be performed.Type: GrantFiled: February 13, 2002Date of Patent: August 30, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Keijiro Take, Shuuji Itou, Toshiaki Tomisawa