Patents by Inventor May Takada

May Takada 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).

  • Patent number: 10375688
    Abstract: It is provided a wireless communication system comprising base stations that transmit data to a terminal with cooperation by the base stations. The terminal communicates with the base stations. The terminal periodically transmits, to one of the base stations, information necessary for data transmission from a single base station out of the base stations. Each of the base stations determines whether the terminal needs data transmission through a cooperation among the base stations, and transmits a cooperation information transmission instruction to the terminal, which includes information necessary to execute the data transmission in order to cooperate among the base stations in the case where it is determined that the terminal needs the data transmission through the cooperation among the base stations. The terminal transmits the cooperation information to the base stations in a case of receiving the cooperation information transmission instruction.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: August 6, 2019
    Assignee: GODO KAISHA IP BRIDGE 1
    Inventors: Go Ono, Kenzaburo Fujishima, May Takada, Koki Uwano
  • Publication number: 20160198458
    Abstract: It is provided a wireless communication system comprising base stations that transmit data to a terminal with cooperation by the base stations. The terminal communicates with the base stations. The terminal periodically transmits, to one of the base stations, information necessary for data transmission from a single base station out of the base stations. Each of the base stations determines whether the terminal needs data transmission through a cooperation among the base stations, and transmits a cooperation information transmission instruction to the terminal, which includes information necessary to execute the data transmission in order to cooperate among the base stations in the case where it is determined that the terminal needs the data transmission through the cooperation among the base stations. The terminal transmits the cooperation information to the base stations in a case of receiving the cooperation information transmission instruction.
    Type: Application
    Filed: March 17, 2016
    Publication date: July 7, 2016
    Inventors: Go ONO, Kenzaburo FUJISHIMA, May TAKADA, Koki UWANO
  • Patent number: 8971318
    Abstract: A multistage relay communication system 100 includes a trunk network 1 and branch networks 2 (2a, 2b), each of which includes one or more communication apparatuses 4. The communication apparatus 4 can switch between a trunk mode to operate in the trunk network 1 and a branch mode to operate in the branch network 2. In the trunk network 1, the communication apparatus 4 carries out fixing of a communication path and redundancy of data based on a path table in order to achieve real-timeness and a data arrival rate. Meanwhile, in the branch network 2, when a communication failure occurs, the communication apparatus 4 autonomously searches for a communication path and constructs a path table, in order to at least secure a data arrival rate even if real-timeness is impaired within an allowable range.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: March 3, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Yamada, Noritaka Matsumoto, Kazuya Shimoyama, Yoshihito Sato, May Takada, Masayuki Miyazaki
  • Patent number: 8879577
    Abstract: Provided is a monitoring system which can perform priority control in accordance with the wideband limitation. A priority/filter type selection processing unit (37) of a network interconnection device (11), which connects a local network (14) and a wide area network (10), selects a transmission data selection processing unit (38) on the basis of the priority level definitions of a transmission data in accordance with an event status, and a data compression method in association with the event status and the wide area network communication status, and selects and controls a filtering processing unit (33). As a consequence, the communication bandwidth in a wide area network is reduced.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: November 4, 2014
    Assignee: Hitachi, Ltd.
    Inventors: May Takada, Yuji Ogata, Masaki Yamada, Nobuyuki Muranaka
  • Patent number: 8831609
    Abstract: In a wireless communications system operating according to CDMA or the like, when one terminal simultaneously performs communication using multiple wireless resources (e.g., multiple carriers), there was a problem that when it was attempted to guarantee network mobility by the same soft handoff system as in the case where communication was performed using only one wireless resource, efficiency suffered from the viewpoint of network forwarding load, processing load and wireless resource occupancy time. Soft handoff termination is judged and soft handoff is forcibly terminated according to whether or not the data rate obtained for all resources on the network side satisfies a requested rate, based on a reception state notification from a terminal concerning wireless resources.
    Type: Grant
    Filed: February 21, 2011
    Date of Patent: September 9, 2014
    Assignee: Hitachi, Ltd.
    Inventors: May Takada, Yosuke Takahashi, Shiro Mazawa, Rintaro Katayama
  • Patent number: 8705386
    Abstract: A plurality of wireless communication methods are combined, networks to be used are dynamically selected by evaluating each network quality, and a packet format is changed adaptively to realize necessary reliability. The wireless communication apparatus has a network interface, a data interface, a quality interface, an allocation control part, a quality database, a quality update part, communication units and antennas. The wireless communication apparatus receives data and a requested quality from an application apparatus, selects the communication unit and communication method suitable for the requested quality, and transmits the data and requested quality. The communication unit receives a communication quality of the communication partner, and the quality update part updates the communication quality state in the quality database.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: April 22, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Tsutomu Yamada, Yoshinori Okura, Yoshihito Sato, May Takada
  • Publication number: 20130185417
    Abstract: Even though a network with communication rate large fluctuations is applied to a remote monitoring system, data communication delay time is kept smaller for which a shorter communication delay time is demanded and a high throughput is implemented. A sensor equipped terminal sends measurement data to a network interconnection device. A priority level determining unit of the device sorts the data into first data necessary to be delivered to a monitoring center within requested communication delay time and second data not necessarily to be delivered to the center within requested communication delay time. A transmission buffer unit is a buffer storing the first and second data accumulated in first and second data accumulating units in sending the data to a wide area network by FIFO. A transmission control unit dynamically controls a rate in causing the data to come in the transmission buffer unit based on a network communication rate.
    Type: Application
    Filed: July 12, 2012
    Publication date: July 18, 2013
    Inventors: Shoji YUNOKI, May TAKADA, Satoshi TAMAKI, Tsutomu KONNO, Takehito IWASAKI
  • Patent number: 8447311
    Abstract: A radio communications system includes at least one terminal communication unit having one antenna that conducts a radio communication with a plurality of terminals; and at least one baseband modem that generates and decrypts a data signal, a cell being configured by at least one of the antenna, wherein the baseband modem divides a radio frequency band used for the radio communication into two or more subbands, generates and decrypts the data signal specific to each of the divided subbands, and allocates the data signal specific to the subband to the terminal communication unit, and wherein the terminal communication unit receives the data signal specific to the subband generated by the baseband modem, and forms the cell of each the subband by the data signal specific to the received subband.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: May 21, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Kenzaburo Fujishima, May Takada, Katsuhiko Tsunehara, Satoshi Tamaki, Shinya Sasaki, Go Ono, Koki Uwano
  • Publication number: 20130121238
    Abstract: A multistage relay communication system 100 includes a trunk network 1 and branch networks 2 (2a, 2b), each of which includes one or more communication apparatuses 4. The communication apparatus 4 can switch between a trunk mode to operate in the trunk network 1 and a branch mode to operate in the branch network 2. In the trunk network 1, the communication apparatus 4 carries out fixing of a communication path and redundancy of data based on a path table in order to achieve real-timeness and a data arrival rate. Meanwhile, in the branch network 2, when a communication failure occurs, the communication apparatus 4 autonomously searches for a communication path and constructs a path table, in order to at least secure a data arrival rate even if real-timeness is impaired within an allowable range.
    Type: Application
    Filed: June 11, 2010
    Publication date: May 16, 2013
    Applicant: HITACHI, LTD.
    Inventors: Tsutomu Yamada, Noritaka Matsumoto, Kazuya Shimoyama, Yoshihito Sato, May Takada, Masayuki Miyazaki
  • Publication number: 20120320928
    Abstract: Provided is a monitoring system which can perform priority control in accordance with the wideband limitation. A priority/filter type selection processing unit (37) of a network interconnection device (11), which connects a local network (14) and a wide area network (10), selects a transmission data selection processing unit (38) on the basis of the priority level definitions of a transmission data in accordance with an event status, and a data compression method in association with the event status and the wide area network communication status, and selects and controls a filtering processing unit (33). As a consequence, the communication bandwidth in a wide area network is reduced.
    Type: Application
    Filed: February 14, 2011
    Publication date: December 20, 2012
    Applicant: HITACHI, LTD.
    Inventors: May Takada, Yuji Ogata, Masaki Yamada, Nobuyuki Muranaka
  • Publication number: 20120317278
    Abstract: In a remote monitoring system including a monitoring center, a sensing information collecting station, and one or more sensing terminals, the sensing information collecting station collects measurement results measured by the sensing terminals, classifies the collected measurement results into priority information and general information, and transmits priority information and general information to the monitoring center. The monitoring center transmits response information to received priority information to the sensing information collecting station. The sensing information collecting station estimates network condition from a delay time based on the response information and decreases the transmission rate of general information when the estimated network condition is more congested. Thereby, even if the network condition fluctuates, desired information such as statistical information on measurement results and measurement results meeting a predetermined condition is communicated stably at low delay.
    Type: Application
    Filed: June 5, 2012
    Publication date: December 13, 2012
    Applicant: HITACHI, LTD.
    Inventors: Satoshi TAMAKI, May TAKADA, Shoji YUNOKI
  • Patent number: 8204144
    Abstract: Provided is a wireless communication system, comprising: a wireless communication apparatus which performs adaptive modulation for changing a modulation method and an encoding rate of a data channel, and transmits/receives a signal via MIMO multiplexing. The control information comprises first control information to be used for a MIMO stream separation process and second control information not to be used for the MIMO stream separation process. The selections in the second control information are changed corresponding to selected first control information.
    Type: Grant
    Filed: June 12, 2009
    Date of Patent: June 19, 2012
    Assignee: Hitachi, Ltd.
    Inventors: May Takada, Satoshi Tamaki, Shigeyuki Ejiri
  • Publication number: 20120120876
    Abstract: In a cellular radio communication system, a base station or a mobile station has a TA (Time Alignment)-range-out detection function, so that when a TA-range-out state that is unable to compensate with a guard interval is detected, the transmission condition of an uplink signal at the mobile station is changed by the mobile station autonomously or by the base station and the mobile station cooperatively.
    Type: Application
    Filed: January 24, 2012
    Publication date: May 17, 2012
    Inventors: Tomonori YAMAMOTO, Katsuhiko TSUNEHARA, Satoshi TAMAKI, May TAKADA, Mikio KUWAHARA
  • Patent number: 8111683
    Abstract: In a cellular radio communication system, a base station or a mobile station has a TA (Time Alignment)-range-out detection function, so that when a TA-range-out state that is unable to compensate with a guard interval is detected, the transmission condition of an uplink signal at the mobile station is changed by the mobile station autonomously or by the base station and the mobile station cooperatively.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: February 7, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Tomonori Yamamoto, Katsuhiko Tsunehara, Satoshi Tamaki, May Takada, Mikio Kuwahara
  • Publication number: 20110287798
    Abstract: It is provided a wireless communication system comprising base stations that transmit data to a terminal with cooperation by the base stations. The terminal communicates with the base stations. The terminal periodically transmits, to one of the base stations, information necessary for data transmission from a single base station out of the base stations. Each of the base stations determines whether the terminal needs data transmission through a cooperation among the base stations, and transmits a cooperation information transmission instruction to the terminal, which includes information necessary to execute the data transmission in order to cooperate among the base stations in the case where it is determined that the terminal needs the data transmission through the cooperation among the base stations. The terminal transmits the cooperation information to the base stations in a case of receiving the cooperation information transmission instruction.
    Type: Application
    Filed: January 30, 2009
    Publication date: November 24, 2011
    Applicant: Hitachi, Ltd.
    Inventors: Go Ono, Kenzaburo Fujishima, May Takada, Koki Uwano
  • Publication number: 20110287791
    Abstract: It is provided a wireless communication system comprising base stations that communicate with a terminal. Each of the base station has antennas. Each of the base stations transmits a first reference signal unique to each of the antennas which does not overlap with another antenna among the base stations at least in a vicinity thereof. The terminal receives the first reference signal and estimates a received power of the first reference signal for each of the antennas, selects antennas suitable for communication from among the antennas based on a result of estimating the received power, and transmits a result of selecting the antennas to the each of the base stations. The each of the base stations refers the result of selecting the antennas transmitted from the terminal, assigns the selected antennas belonging to different cells to the terminal, and notifies the terminal of a result of assigning the antennas.
    Type: Application
    Filed: January 30, 2009
    Publication date: November 24, 2011
    Applicant: Hitachi Ltd
    Inventors: Kenzaburo Fujishima, Go Ono, May Takada, Koki Uwano
  • Publication number: 20110182196
    Abstract: A network system includes one or more terminals which transmit acquired data to a first network, a network interconnection device which is connected to the terminal via the first network and which receives the data from the terminal, and a management server which is connected to the network interconnection device via a second network and which receives the data from the network interconnection device; the terminal transmits the same data to the network interconnection device via the first network by a frequency corresponding to redundancy; the data contains the priority according to the contents of the data; and the network interconnection device acquires the communication quality of the second network and instructs the terminal to transmit the data according to redundancy determined based upon the acquired communication quality and the priority.
    Type: Application
    Filed: January 7, 2011
    Publication date: July 28, 2011
    Inventors: Shoji YUNOKI, May Takada, Toshiyuki Odaka, Masayuki Miyazaki, Tsutomu Yamada
  • Publication number: 20110142007
    Abstract: In a wireless communications system operating according to CDMA or the like, when one terminal simultaneously performs communication using multiple wireless resources (e.g., multiple carriers), there was a problem that when it was attempted to guarantee network mobility by the same soft handoff system as in the case where communication was performed using only one wireless resource, efficiency suffered from the viewpoint of network forwarding load, processing load and wireless resource occupancy time. Soft handoff termination is judged and soft handoff is forcibly terminated according to whether or not the data rate obtained for all resources on the network side satisfies a requested rate, based on a reception state notification from a terminal concerning wireless resources.
    Type: Application
    Filed: February 21, 2011
    Publication date: June 16, 2011
    Applicant: Hitachi, Ltd.
    Inventors: May Takada, Yosuke Takahashi, Shiro Mazawa, Rintaro Katayama
  • Publication number: 20110134876
    Abstract: It is provided a base station for providing a wireless communication area, which is coupled to a core network via a gateway, including: an interface for receiving settings of availability of allocation to terminals located in a border area of the wireless communication area and availability of allocation to terminals located in an area other than the border area for each of radio resource blocks which are defined by dividing radio resources available for use in the wireless communication area provided by the base station into predetermined units; and a plurality of profiles for defining scheduling limitations on the radio resources in the number of the profiles of patterns, being set via the interface, in which the base station applies scheduling limitations defined by the profile designated with the identifier and allocates the radio resources upon designation of one of the plurality of profiles with an identifier.
    Type: Application
    Filed: March 6, 2009
    Publication date: June 9, 2011
    Applicant: Hitachi, Ltd.
    Inventors: May Takada, Kenzaburo Fujishima, Koki Uwano
  • Patent number: 7894817
    Abstract: In a wireless communications system operating according to CDMA or the like, when one terminal simultaneously performs communication using multiple wireless resources (e.g., multiple carriers), there was a problem that when it was attempted to guarantee network mobility by the same soft handoff system as in the case where communication was performed using only one wireless resource, efficiency suffered from the viewpoint of network forwarding load, processing load and wireless resource occupancy time. Soft handoff termination is judged and soft handoff is forcibly terminated according to whether or not the data rate obtained for all resources on the network side satisfies a requested rate, based on a reception state notification from a terminal concerning wireless resources.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: February 22, 2011
    Assignee: Hitachi, Ltd.
    Inventors: May Takada, Yosuke Takahashi, Shiro Mazawa, Rintaro Katayama