Patents by Inventor Mutsumu Serizawa

Mutsumu Serizawa 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).

  • Publication number: 20150204964
    Abstract: A radio base station performs wireless communication with a wireless terminal. The radio base station includes a directivity pattern specifying unit, a communication unit, and a signal processor. The directivity pattern specifying unit specifies plural directivity patterns. The communication unit receives a search request frame from the wireless terminal, sends to the wireless terminal a search response frame which is a response to the search request frame, with at least one, specified by the directivity pattern specifying unit, of the directivity patterns, and receives a delivery acknowledgment frame for the search response frame from the wireless terminal with the directivity patterns specified by the directivity pattern specifying unit. The signal processor calculates, for each specified directivity pattern, a radio wave intensity of the delivery acknowledgment frame.
    Type: Application
    Filed: January 16, 2015
    Publication date: July 23, 2015
    Inventors: Tatsuma HIRANO, Cam Ly NGUYEN, Hiroyuki KITAGAWA, Ren SAKATA, Takuya KAWAMURA, Mutsumu SERIZAWA
  • Patent number: 7502407
    Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: March 10, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
  • Patent number: 7489954
    Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: February 10, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
  • Publication number: 20080261649
    Abstract: A radio communication apparatus compatible with a plurality of communication systems and application services comprises a radio transmitting/receiving unit for transmitting and receiving a radio signal, signal processing circuit for executing part of digital signal processing which may be executed when a radio signal is transmitted or received, first processors connected to the signal processing circuit for at least executing communication control related to connection between the radio communication apparatus and the communication systems, and an application program related to the application services, and second processors connected to the signal processing circuit for at least executing another part of the digital signal processing, and control of the signal processing circuit, the amount of processing of the second processors being greater than the amount of processing of the first processors, the processing concerning the executing unit.
    Type: Application
    Filed: December 10, 2007
    Publication date: October 23, 2008
    Inventors: Manabu Mukai, Takeshi Tomizawa, Daisuke Takeda, Takashi Wakutsu, Mutsumu Serizawa
  • Patent number: 7386329
    Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: June 10, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
  • Publication number: 20080049665
    Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.
    Type: Application
    Filed: October 24, 2007
    Publication date: February 28, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
  • Publication number: 20080032757
    Abstract: One of objects of a wireless communication apparatus according to the present invention is to realize stable communication regardless of received signal strength indication and information amount. The wireless communication apparatus for communicating in an autonomous distributed wireless network includes a detection unit which generates a detection signal by detecting a first wireless signal from a first wireless apparatus; a wireless circuit which receives a second wireless signal relating to said first wireless signal, transmitted from a second wireless apparatus which received said first wireless signal; a signal estimation unit which estimates said detection signal and the received second wireless signal; a signal selector which selects either said detection signal or the received second wireless signal, based on an estimation result of said signal estimation unit; and a demodulator which demodulates the signal selected by said signal selector.
    Type: Application
    Filed: October 5, 2007
    Publication date: February 7, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Syuichi SEKINE, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Kiyoshi Toshimitsu, Tomoko Adachi, Tsuguhide Aoki, Ren Sakata, Ryoko Matsuo
  • Patent number: 7319714
    Abstract: A wireless communication system which transmits and receives a signal by using a plurality of wireless apparatuses, comprising: a first wireless apparatus group having a plurality of transmitting apparatuses, each transmitting a wireless signal based on a first control signal, said first wireless apparatus group forming a first ad-hoc network between said transmitting apparatuses; and a second wireless apparatus group having a plurality of destination apparatuses, each receiving the wireless signal transmitted from said first wireless apparatus group, said second wireless apparatus group transmitting and receiving the wireless signal received by said destination apparatuses based on a second control signal, and said second wireless apparatus group forming a second ad-hoc network between said destination apparatuses different from said first ad-hoc network.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: January 15, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ren Sakata, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Tomoko Adachi, Kiyoshi Toshimitsu, Tsuguhide Aoki
  • Patent number: 7319885
    Abstract: A radio communication apparatus compatible with a plurality of communication systems and application services comprises a radio transmitting/receiving unit for transmitting and receiving a radio signal, signal processing circuit for executing part of digital signal processing which may be executed when a radio signal is transmitted or received, first processors connected to the signal processing circuit for at least executing communication control related to connection between the radio communication apparatus and the communication systems, and an application program related to the application services, and second processors connected to the signal processing circuit for at least executing another part of the digital signal processing, and control of the signal processing circuit, the amount of processing of the second processors being greater than the amount of processing of the first processors, the processing concerning the executing unit.
    Type: Grant
    Filed: March 21, 2003
    Date of Patent: January 15, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Manabu Mukai, Takeshi Tomizawa, Daisuke Takeda, Takashi Wakutsu, Mutsumu Serizawa
  • Patent number: 7269148
    Abstract: A communication scheme for improving the performance of communications utilizing the transport layer connection provided via a radio network, by enabling a control of the transport layer connection according to the radio communication state and property of the radio terminal, without changing implementation of the transport layer of a terminal connected to a wire network. The gateway device is provided with a control unit for controlling a connection in the radio transport layer protocol according an information regarding a radio communication state of the radio terminal device, where the information regarding the radio communication state of the radio terminal device is notified from either a radio base station device covering a radio service area in which the radio terminal device is located or a home location register for carrying out at least registration and management of the radio terminal device.
    Type: Grant
    Filed: July 8, 2002
    Date of Patent: September 11, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiro Takagi, Noriyasu Kato, Keiji Tsunoda, Kumiko Nakakita, Katsuya Nounin, Mutsumu Serizawa, Eiji Kamagata
  • Patent number: 7194262
    Abstract: An object of the present invention is to provide a wireless communication system, a wireless communication system, comprising: one or more wireless base station; and a plurality of wireless terminals capable of communicating with said wireless base station by wireless, two or more of said wireless terminals capable of communicating with each other by wireless thereby forming a wireless terminal group; wherein said wireless base station has a representative determination unit configured to determine at least one wireless terminal belonging to said wireless terminal group as a representative terminal; and said representative terminal receives first frames transmitted from other wireless terminals belonging to said wireless terminal group, and transmits the received first frames to said wireless base station.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: March 20, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsuguhide Aoki, Tomoko Adachi, Kiyoshi Toshimitsu, Syuichi Sekine, Mutsumu Serizawa, Hiroki Shoki, Hiroshi Tsurumi, Shuichi Obayashi, Ren Sakata
  • Patent number: RE41132
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: February 16, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE43654
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: September 11, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE43713
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: October 2, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE43800
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: November 13, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE43821
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: November 20, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE43950
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: January 29, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE44074
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: March 12, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE44143
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 9, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai
  • Patent number: RE44202
    Abstract: A large amount of user information is transmitted with good efficiency by means of a high-speed downlink by making transmission rates of an uplink circuit and a downlink asymmetrical. The radio communication system includes a plurality of base stations, a plurality of terminals, an uplink established between each of the base stations and each of the terminals for the purpose of radio transmission of prescribed information from a terminal to a base station, and a downlink circuit established between each of the terminals and each of the base station for the purpose of radio transmission of prescribed data from a base station to a terminal.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: May 7, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mutsumu Serizawa, Nobuyasu Nakajima, Koji Ogura, Minoru Namekata, Takashi Wakutsu, Manabu Mukai