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: 8208923
    Abstract: An upper node and a handover source radio base station store setup information on an access bearer having been set up between the upper node and the handover source radio base station. A mobile communication method according to the present invention includes the steps of: (A) informing, from the handover source radio base station to a handover target radio base station, the access bearer setup information; (B) storing, at the handover target radio base station, the access bearer setup information informed of by the handover target radio base station; and (C) setting up, at the upper node, an access bearer between the upper node and the handover target radio base station by using the stored access bearer setup information without performing reallocation processing of new access bearer setup information, the access bearer being set up in response to a path switching request from the handover target radio base station.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: June 26, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masayuki Motegi, Wuri Andarmawanti Hapsari, Yoshitsugu Shimazu, Yasuhiro Kato, Takehiro Nakamura
  • Patent number: 8203987
    Abstract: A user apparatus which wirelessly communicates with a base station apparatus within a mobile communications system is disclosed. The user apparatus includes a receive unit which receives control information in downlink; and a transmit unit which transmits a first channel in uplink, wherein the transmit unit, based on the control information, makes a value of a maximum transmit power of the first channel smaller than that of a nominal power specified for the mobile communications system.
    Type: Grant
    Filed: March 21, 2008
    Date of Patent: June 19, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Takehiro Nakamura
  • Patent number: 8200223
    Abstract: A base station according to the present invention includes: a data storage unit 119 configured to temporarily store user data, when the base station transmits and receives the user data to and from a mobile station; an identifier adding unit 116 configured to add, to the user data stored in the data storage unit, a transfer identifier which indicates that the user data is transferred to an other base station by a handover, when the mobile station performs the handover from the base station to the other base station; and a data transfer unit 118 configured to transfer, to the other base station through a transfer apparatus, the user data to which the transfer identifier is added.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: June 12, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Atsushi Harada, Masayuki Motegi, Sadayuki Abeta, Takehiro Nakamura
  • Patent number: 8195173
    Abstract: A transmission rate control method for controlling a transmission rate of user data transmitted by a mobile station via an uplink, include: notifying, at a radio network controller, a maximum allowable transmission rate of the user data to the mobile station, when the mobile station starts communications or when a cell to which the mobile station is to be connected is changed; and automatically increasing, at the mobile station, the transmission rate of the user data to the maximum allowable transmission rate that is notified by the radio network controller.
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: June 5, 2012
    Assignee: NTT DoCoMo
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8189519
    Abstract: The logical channels are made to include a logical channel for control and a logical channel for data transmission, the radio physical channel are made to be commonly used for a plurality of logical channels, and one logical channel is made to have a correspondence relationship with one radio physical channel, and the channel assignment apparatus includes: traffic monitoring detection means that detects occurrence of traffic of the logical channels; and logical channel assignment means that, according to occurrence of the traffic of the logical channels, sequentially assigns required resources on the radio physical channel to the logical channels, so that the object is achieved.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: May 29, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masayuki Motegi, Yasuhiro Kato, Minami Ishii, Takehiro Nakamura
  • Patent number: 8189505
    Abstract: The present invention avoids deterioration in the radio quality caused by a transmission interruption of uplink user data, by periodically controlling an outer loop transmission power.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: May 29, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8189528
    Abstract: A base station includes a multicast group administration unit administering a multicast group to which a mobile station belongs, a timing determination unit determining an inter-frequency measurement timing when the mobile station measures a signal having a frequency different from a frequency for a residing cell of the mobile station, and a transmission unit transmitting data. The timing determination unit assigns an uniform inter-frequency measurement timing for at least two mobile stations belonging to the same multicast group. The transmission unit transmits data to a mobile station within the multicast so as to avoid the inter-frequency measurement timing.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: May 29, 2012
    Assignee: NTT DoCoMo
    Inventors: Anil Umesh, Minami Ishii, Takehiro Nakamura, Takashi Suzuki
  • Patent number: 8175602
    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 neighbor 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: Grant
    Filed: August 15, 2008
    Date of Patent: May 8, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mikio Iwamura, Takehiro Nakamura
  • Patent number: 8165529
    Abstract: A radio base station for establishing a signaling control channel and a shared data channel for a mobile station and communicating with the mobile station includes a broadcast information generating unit configured to generate broadcast information including one or more information blocks; a scheduling information generating unit configured to generate scheduling information for the one or more information blocks; and a broadcast information transmitting unit configured to transmit the scheduling information as part of the broadcast information.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: April 24, 2012
    Assignee: NTT DoCoMo, Inc.
    Inventors: Minami Ishii, Sadayuki Abeta, Takehiro Nakamura
  • Publication number: 20120094676
    Abstract: A mobile communication method according to the present invention includes the steps: transmitting, from an exchange (MME) to a first radio base station (eNB), a location information reporting instruction which provides an instruction to report location information on a mobile station (UE); reporting, the first radio base station (eNB) to the exchange (MME), the location information on the mobile station (UE), in accordance with the location information reporting instruction; transmitting, the location information reporting instruction to a second radio base station (eNB), in a handover procedure of the mobile station (UE) from the first radio base station (eNB) to the second radio base station (eNB); and reporting, from the second radio base station (eNB) to the exchange (MME), the location information on the mobile station (UE), in accordance with the location information reporting instruction.
    Type: Application
    Filed: December 20, 2011
    Publication date: April 19, 2012
    Applicant: NTT DOCOMO, INC.
    Inventors: Wuri Andarmawanti Hapsari, Minami Ishii, Takehiro Nakamura
  • Publication number: 20120083277
    Abstract: A mobile communication method according to the present invention includes: transmitting, from a mobile station (100) to an access node (200) in a first radio access technology, a connection request signal including a desired call type for communication and a radio access capability of the mobile station (100); determining, at the access node (200) in the first radio access technology, whether or not to perform handover to a second radio access technology on the basis of the desired call type for communication and the radio access capability of the mobile station included in the connection request signal; and transmitting, from the mobile station (100) to an access node in the second radio access technology, a connection request signal, when it is determined that the handover to the second radio access technology is to be performed.
    Type: Application
    Filed: December 15, 2011
    Publication date: April 5, 2012
    Applicant: NTT DOCOMO, INC.
    Inventors: Minami Ishii, Takehiro Nakamura
  • Patent number: 8139523
    Abstract: When an HSDPA and an Enhanced Uplink are applied, a dedicated physical channel, a high speed dedicated physical control channel, and an enhanced dedicated physical control channel are made to follow only a TPC bit of a serving cell; and when a received power of an enhanced dedicated physical data channel is large, a non-serving cell instructs a mobile station UE to reduce the transmission rate of the enhanced dedicated physical data channel so that an interference power from an adjacent cell in an uplink is controlled while communication quality in a downlink is prevented from deteriorating.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: March 20, 2012
    Assignee: NTT DoCoMo. Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8130740
    Abstract: A radio physical channel is available to multiple logical channels commonly, and multiple radio physical control channels are provided concomitantly with the radio physical channel and include a commonly usable common control channel. A channel transmission apparatus includes a logical channel type determination unit determining a type of a logical channel, and a channel transmission unit transmitting an identifier of the UE in the radio physical control channel depending on the type of the logical channel. A scheme of identifying the UE in the radio physical control channel is modified depending on the type of the logical channel.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: March 6, 2012
    Assignee: NTT Docomo, Inc.
    Inventors: Masayuki Motegi, Yasuhiro Kato, Anil Umesh, Takehiro Nakamura
  • Patent number: 8102821
    Abstract: A downlink packet scheduling method is disclosed for a shared channel or a common channel in a mobile communication system between a base station and a mobile station, the method including a step in which the base station determines whether there is a waiting packet to be transmitted to the mobile station other than a current transmission packet; a step in which when it is determined that there is no waiting packet to be transmitted, the base station sets a stop period “t” in which packet transmission is temporarily stopped after the current packet transmission; a step in which the base station transmits information indicating the stop period “t” through a schedule information channel transmitting schedule information of downlink packets; and a step in which the base station stops the packet transmission to the mobile station during the stop period “t” after the current packet transmission.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: January 24, 2012
    Assignee: NTT Docomo, Inc.
    Inventors: Yasuhiro Kato, Masayuki Motegi, Anil Umesh, Takehiro Nakamura
  • Patent number: 8098628
    Abstract: A packet communication method according to the present invention includes: transmitting, at a mobile station, a random access request that includes mobile station information assigned to the mobile station, to a radio base station through a random access channel allocated to a predetermined radio resource; receiving, at the radio base station, the random access request from the mobile station; and transmitting, at the radio base station, a random access response signal that notifies the receipt of the random access request and includes the mobile station information, to the mobile station through a downlink shared control channel corresponding to the random access channel.
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: January 17, 2012
    Assignee: NTT Docomo, Inc.
    Inventors: Sadayuki Abeta, Minami Ishii, Takehiro Nakamura
  • Patent number: 8085661
    Abstract: A control channel allocation apparatus includes a memory portion that stores an identifier indicating a layer 1 control channel associated with a downlink data channel, and a physical channel parameter for transmitting an uplink layer 1 control channel, the identifier being related to the physical channel parameter; a physical layer parameter determination portion that determines the physical channel parameter for transmitting the uplink layer 1 control channel in accordance with the identifier; a layer 1 control channel generation portion that generates a layer 1 control channel indicating a decoding result of a data channel, in accordance with the determined physical channel parameter; and a transmission portion that transmits the generated layer 1 control channel.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: December 27, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Atsushi Harada, Sadayuki Abeta, Takehiro Nakamura
  • Publication number: 20110300869
    Abstract: A radio access network apparatus includes; a receiver unit 211 configured to obtain, from a mobile station, radio quality data that indicates a radio quality of a communication link between the mobile station and a base station; a command generating unit 261a configured to generate a measurement command for instructing the mobile station to initiate a measurement of a communication status of a neighbour cell of the mobile station, when the radio quality data satisfies a predetermined condition; and a transmitter unit 281 configured to transmit the measurement command to the mobile station.
    Type: Application
    Filed: August 15, 2011
    Publication date: December 8, 2011
    Applicant: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Minami Ishii, Takehiro Nakamura
  • Patent number: 8073404
    Abstract: An object of the present invention is to specify how a transmission diversity station that implements an EUL should apply a transmission antenna diversity to an E-HICH, an E-RGCH and an E-AGCH. The present invention relates to a mobile communication method for transmitting a signal from a base station to a mobile station via a downlink. In the method, a closed loop transmission antenna diversity is applied to a dedicated channel of the downlink, and an open loop transmission antenna diversity is applied to a control channel of the downlink in conformity with an uplink high efficient transmission method.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: December 6, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Anil Umesh, Masafumi Usuda, Takehiro Nakamura
  • Patent number: 8060023
    Abstract: In a mobile communication system according to the present invention, a data transmitting-side apparatus is configured to retransmit a transmission data block according to a transmission acknowledgement signal transmitted from a data receiving-side apparatus. The data receiving-side apparatus includes: a maximum number-of-retransmissions manager unit configured to manage the maximum number of retransmissions of the transmission data block; and a transmission acknowledgement signal transmitter unit configured not to transmit the transmission acknowledgement signal, when the number of retransmissions of the transmission data block reaches the maximum number of retransmissions.
    Type: Grant
    Filed: November 9, 2005
    Date of Patent: November 15, 2011
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Publication number: 20110260450
    Abstract: In a resin pipe joint having a configuration where, by a screw advancement of a union nut caused by screwing an internal thread to an external thread in a state where a tube is externally fitted to an inner cylinder to form a flared portion, a flaring changing region is pressed by a seal pressing portion, a torque varying portion in which projecting portions of a joint body and recess portions of the union nut are fitted to or unfitted from each other by a flexural displacements of the projecting portions in the direction of the axis in accordance with fastening rotation of the union nut from the vicinity of a portion in front of an end of the screw advancement, the screw advancement being caused by pressing of the seal pressing portion against the flaring changing region is configured.
    Type: Application
    Filed: November 6, 2009
    Publication date: October 27, 2011
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Ryo Imanishi, Masateru Yamada, Kazukiyo Teshima, Takehiro Nakamura, Takayuki Kishimoto, Akihiro Masuda, Takeshi Nakagawa