Patents by Inventor Takehiro Nakamura

Takehiro Nakamura 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: 8045590
    Abstract: The present invention relates to a radio communications system which transmits same downlink information to a plurality of cells by using downlink common channels. The radio communications system includes a radio network controller and a base station. The radio communications system is configured to measure delays between the time when the radio network controller transmits the downlink information and the time when the base station transmits the downlink information to each of the plurality of cells; and to control timing for transmitting the downlink information to each of the plurality of cells by the base station in accordance with measured delays.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: October 25, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Minami Ishii, Sung Uk Moon, Takehiro Nakamura, Anil Umesh
  • Patent number: 8045516
    Abstract: A target base station transmits a traffic assignment signal a plurality of times to a control station for notifying a traffic amount of downlink data that can be processed by the target base station, after a notified cell change timing in which the mobile station changes a communicating base station.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: October 25, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Tomoki Sao, Shinya Tanaka, Hiroyuki Ishii, Takehiro Nakamura
  • Patent number: 8027676
    Abstract: A radio network controller can set up a connection with a mobile station located in a specific cell under control of the radio network controller. The radio network controller includes a connection setup request transmitter configured to transmit a connection setup request for request to set up the connection to the mobile station located in the specific cell; and a judger configured to judge whether or not to need to acquire information of the mobile station located in the specific cell. The connection setup request transmitter is configured to transmit the connection setup request to the mobile station located in the specific cell, when the judger judges to need to acquire the information of the mobile station.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: September 27, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Sung Uk Moon, Minami Ishii, Takehiro Nakamura
  • Patent number: 8023460
    Abstract: A radio base station transmits user common data provided from a user common data control apparatus connected to a communication network to a plurality of mobile stations by radio. The radio base station includes a frame loss detection unit configured to detect loss of user common data that occurs on a transmission route between the radio base station and the user common data control apparatus, and a timing adjustment unit configured to change transmission timing of the user common data for the mobile station according to the loss of the user common data.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: September 20, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masayuki Motegi, Yasuhiro Kato, Minami Ishii, Takehiro Nakamura
  • Publication number: 20110221190
    Abstract: A resin pipe joint in which, although an economical configuration formed by two components or a joint body and a union nut is employed, both a resistance against pulling and an excellent sealing property can be attained is provided.
    Type: Application
    Filed: July 14, 2009
    Publication date: September 15, 2011
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Kazukiyo Teshima, Akihiro Masuda, Takehiro Nakamura, Masateru Yamada, Takayuki Kishimoto, Toshiyuki Fukumoto, Ryo Imanishi
  • Patent number: 8014803
    Abstract: A disclosed mobile station includes a storage unit configured to establish a correspondence between an identifier for a downlink Layer-1 control channel associated with a downlink data channel and a physical channel parameter for an uplink Layer-1 control channel and to store the identifier and the physical channel parameter; and a unit configured to determine the physical channel parameter based on the identifier and generate the uplink Layer-1 control channel. A disclosed base station includes a storage unit; a unit configured to measure reception quality based on a signal transmitted from the mobile station, select the physical channel parameter and generate the downlink Layer-1 control channel corresponding to the physical channel parameter; and a transmitting unit configured to transmit control information on the generated downlink Layer-1 control channel.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: September 6, 2011
    Assignee: NTT DoCoMo, Inc
    Inventors: Atsushi Harada, Sadayuki Abeta, Takehiro Nakamura
  • Patent number: 8014348
    Abstract: The object of the present invention is to provide a radio access network system which can adapt to an environment in each network domain, and can carry out the priority transmission control of the IP packets in consideration of traffic requirements. The control apparatus 3 has a priority information setter configured to set priority information for determining a priority of the packet to be transferred in a transfer path set in the network, and a packet processor configured to determine the priority of the received packet in accordance with the priority information, and to add the priority to the received packet.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: September 6, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masayuki Koshino, Mayu Yamada, Takehiro Nakamura
  • Patent number: 8014808
    Abstract: A radio communication control system controlling a transmission power of a shared control channel for transmitting a control signal to a plurality of mobile stations. The system includes a transmission power lower limit value setting section configured to set a lower limit value of the transmission power of the shared control channel, and to set the transmission power of the shared control channel at the lower limit value when the transmission power of the shared control channel is lower than the lower limit value.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: September 6, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Akihito Hanaki, Tomoki Sao, Takehiro Nakamura
  • Publication number: 20110210544
    Abstract: A resin pipe joint in which, although an economical configuration formed by two components or a joint body and a union nut is employed, both a resistance against pulling and an excellent sealing property can be attained is provided.
    Type: Application
    Filed: July 14, 2009
    Publication date: September 1, 2011
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Kazukiyo Teshima, Akihiro Masuda, Takehiro Nakamura, Masateru Yamada, Takayuki Kishimoto, Toshiyuki Fukumoto, Takeshi Nakagawa, Ryo Imanishi
  • Patent number: 8005120
    Abstract: A base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station; a radio stage connected to the transmitting and receiving amplifier for carrying out D/A conversion of a transmitted signal that undergoes baseband spreading, followed by quadrature modulation, and for carrying out quasi-coherent detection of a received signal, followed by A/D conversion; a baseband signal processor connected with the radio stage for carrying out baseband signal processing of the transmitted signal and the received signal; a transmission interface connected with the baseband signal processor for implementing interface with external channels; and a base station controller for carrying out control such as management of radio channels and establishment and release of the radio channels. The base station communicates with the external channels by mapping logical channels into physical channels. The CDMA signals are spread using a short code and a long code.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: August 23, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Takehiro Nakamura, Junichiro Hagiwara, Etsuhiro Nakano, Koji Ohno, Seizo Onoe, Akihiro Higashi, Motoshi Tamura, Masatomo Nakano, Hiroshi Kawakami, Hiroki Morikawa
  • Patent number: 8005440
    Abstract: A mobile station apparatus communicates with a wireless base station apparatus to which closed-loop transmission diversity control is applied, the closed-loop transmission diversity control controlling phases of signals transmitted from two antennas based upon feedback information notified by the mobile station apparatus and transmitting the signals. The mobile station apparatus includes a control unit which determines whether to reflect an estimated phase result of the signals transmitted from the two antennas or not, depending on a channel type of signals transmitted from the wireless base station apparatus.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: August 23, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Takehiro Nakamura
  • Patent number: 8000300
    Abstract: A mobile station includes a radio channel condition evaluation unit evaluating a radio channel condition; a radio channel condition averaging unit averaging the evaluated radio channel condition over a predefined time period; a radio channel condition threshold storage unit storing a threshold of the radio channel condition and a message type, the threshold and the message type being specified by a radio access network apparatus; a radio channel condition comparison unit comparing the averaged radio channel condition with the threshold; and a radio channel condition reporting unit transmitting an identifier and the radio channel condition for a cell to the radio access network apparatus, the averaged radio channel condition of the cell being greater than or equal to the threshold.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: August 16, 2011
    Assignee: NTT Docomo, Inc.
    Inventors: Minami Ishii, Sadayuki Abeta, Takehiro Nakamura
  • Patent number: 7990859
    Abstract: The present invention relates to a packet transmission control device which controls transmission of packets to a plurality of mobile stations. A scheduling unit of the packet transmission control device according to the present invention is configured to schedule the packets to each of the plurality of mobile stations, based on an average transmission rate, a minimum guaranteed transmission rate, a scheduling frequency and capability information.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: August 2, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Yoshimasa Imamura, Akihito Hanaki, Takehiro Nakamura, Shinya Tanaka, Masafumi Usuda
  • Patent number: 7991415
    Abstract: The present invention provides a transmission rate control method for controlling the transmission rate of uplink user data, including the step of; a radio network controller notifies to a radio base station and a mobile station an effective period of an absolute transmission rate control channel, when a call is established or when a serving cell is changed; a radio base station determines whether or not to transmit the absolute transmission rate control channel to each of mobile stations which is performing a communication with the radio base station; and each of the mobile stations determines the transmission rate of the uplink user data, based on a maximum allowable transmission rate mapped to the absolute transmission rate control channel notified by the radio base station.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: August 2, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 7986659
    Abstract: A notification equipment comprises a transmission data determination unit configured to determine whether transmission data to be transmitted to a terminal equipment is first transmission data or repeated transmission data, an instruction data generator configured to generate identification instruction data indicating that the transmission data is the first transmission data or the repeated transmission data based on a transmission data determination result by the transmission data determination unit, and an instruction data transmitter configured to transmit the identification instruction data to the terminal equipment.
    Type: Grant
    Filed: July 11, 2008
    Date of Patent: July 26, 2011
    Assignee: NTT DoCoMo. Inc.
    Inventors: Sung Uk Moon, Minami Ishii, Takehiro Nakamura
  • Publication number: 20110171962
    Abstract: A disclosed user apparatus is for use in a mobile communication system including a macrocell and a closed cell wherein unspecified users are allowed to access the macrocell and specified users are allowed to access the closed cell. The user apparatus includes a measurement unit configured to measure quality of a signal provided from a camped cell in an idle state at a predefined cycle, a cell search unit configured to measure quality of a signal provided from a neighbour cell at a predefined cell search cycle, and a cell reselection unit configured to reselect a cell depending on the cell search result. A frequency of the macrocell is at least partially identical to a frequency of the closed cell. If the user apparatus resides in the macrocell and a predefined reselection criterion is satisfied, the closed cell adjacent to the camped cell is reselected as a standby cell.
    Type: Application
    Filed: August 15, 2008
    Publication date: July 14, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Takehiro Nakamura
  • Patent number: 7978663
    Abstract: The present invention relates to a radio resource control method for controlling a radio resource for transmitting user data via an uplink by a mobile station. A radio base station reports, to a radio network controller, at a predetermined timing, a maximum allowable transmission rate of the user data, which is signaled to the mobile station connected to the radio base station. The radio network controller controls the radio resource based on the reported maximum allowable transmission rate.
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: July 12, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 7974231
    Abstract: A communication control apparatus (30, 10) used in a mobile communication system includes: means (32, 12) that derives a second target communication quality Q2 for TFs other than a reference format from a first target communication quality for the reference format in a plurality of TFs provide for communicating with an upper layer of a physical channel; means (33, 13) that derives a third target communication quality different from the first target communication quality from the first and the second target communication qualities; and means that sets the third target communication quality to be a target value of transmission power control.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: July 5, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Anil Umesh, Masafumi Usuda, Takehiro Nakamura
  • Patent number: 7957755
    Abstract: A mobile station for establishing a signaling control channel and a shared data channel between a radio access network apparatus and the mobile station to perform communication includes discontinuous reception means configured to perform discontinuous reception of broadcast information using the signaling control channel, shared data channel reception determination means configured to determine whether to receive the shared data channel based on an item of broadcast information and information indicating presence or absence of change of content corresponding to the item of the broadcast information that are transmitted by the signaling control channel, and shared data channel reception means configured to receive the shared data channel according to the determination.
    Type: Grant
    Filed: October 23, 2006
    Date of Patent: June 7, 2011
    Assignee: NTT Docomo, Inc.
    Inventors: Minami Ishii, Sadayuki Abeta, Takehiro Nakamura
  • Patent number: 7944893
    Abstract: A signal transmission method checks, when detecting an occurrence of a communication request, whether the communication request is a high speed communication (step S302). In the case of the high speed communication, it checks whether the number of current high speed communications (m) plus one is greater than the upper limit (mmax) of the high speed communication (step S312). If greater, it cancels the request as a call loss (S316), and sets to a variable a the ratio (h) of the rate of the high speed communication to that of a low speed communication. If the communication request is the low speed communication, it sets one to the variable a (step S304). It compares n plus a with nmax (step S306), where n is the total number of all the current communications, a is the value associated with the communication request, and nmax is the upper limit of the number of communications acceptable in a bandwidth, all of which are expressed in terms of the number of the low speed communications.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: May 17, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Shinji Uebayashi, Seizo Onoe, Minami Ishii, Takehiro Nakamura