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: 8615245
    Abstract: A radio network controller includes: a determination unit configured to determine a transmit diversity method to be used to transmit a signal from a base station to a mobile station, in accordance with a soft handover status of the mobile station; and an instruction/notification unit configured to instruct the transmit diversity method to the base station, in accordance with the determination result by the determination unit.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: December 24, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Takehiro Nakamura, Hidehiro Ando, Takuya Sato, Hiroyuki Ishii
  • Patent number: 8614987
    Abstract: A mobile communication method includes the steps of: transmitting, from a first radio base station (S-eNB) to the mobile station (UE) communicating via a first cell under control of the first radio base station (S-eNB), a handover command instructing to perform handover to a second cell under control of a second radio base station (T-eNB); performing, at the mobile station (UE), handover from the first cell to the second cell in response to the handover command; acquiring, at the mobile station (UE), a global cell ID, which can uniquely identify the second cell in at least one mobile communication system, from the handover command; and notifying, from the mobile station (UE) to the location information management server, the acquired global cell ID which can uniquely identify the second cell.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: December 24, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Wuri Andarmawanti Hapsari, Minami Ishii, Takehiro Nakamura
  • Patent number: 8611908
    Abstract: It is an object of the present invention, in a mobile communication system using the Enhanced Uplink, to maximize a capacity of a radio resource for use in a circuit switching channel, and to provide a data communication as a best effort service using an available radio resource. The present invention includes, in the mobile communication system, a step of measuring an enhanced noise rise within a predetermined frequency bandwidth, a step of measuring a total interference noise rise within the predetermined frequency bandwidth, and a step of determining whether or not to set a new channel within the predetermined frequency bandwidth based on the enhanced noise rise and the total interference noise rise in response to a setup request for the new channel from a mobile station UE.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: December 17, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Publication number: 20130331104
    Abstract: A disclosed base station apparatus to be used in a mobile communication system includes a report signal receiving unit, receiving a report signal from one or more user equipment terminals, a radio parameter adjustment unit adjusting radio parameters based on an analysis result of each report signal, a designation unit designating a report condition to be used for each user equipment terminal to determine whether to transmit the report signal and content to be reported in the report signal, and a report unit reporting the report condition and the content to be reported to the one or more user equipment terminals. Further, in the base station apparatus, the report condition is satisfied when a transmission source of a downlink reference signal is a specific cell, and the content to be reported includes a received quality value of the downlink reference signal.
    Type: Application
    Filed: August 16, 2013
    Publication date: December 12, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Takehiro Nakamura, Yasuhiro Kato, Yoshitsugu Shimazu, Masayuki Motegi
  • Patent number: 8582477
    Abstract: The present invention enables, in a mobile communication system using “EUL”, to enhance radio quality by certainly allocating hardware resources at a radio base station. A transmission rate control method according to the present invention includes a step of transmitting, from the radio base station to a mobile station, an RGCH for instructing to increase the transmission rate of uplink user data, only when the radio base station has successfully received the uplink user data transmitted from the mobile station.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: November 12, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8583113
    Abstract: A cell selection method includes steps of: (A) determining, at a mobile station (UE), whether or not a first CSG cell satisfies a predetermined condition, when using a first macro cell as a camped cell; and (B) changing, at the mobile station (UE), the camped cell from the first macro cell to a first CSG cell, when determined that the first CSG cell satisfies the predetermined condition.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: November 12, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mikio Iwamura, Takehiro Nakamura
  • Patent number: 8571561
    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: Grant
    Filed: December 15, 2011
    Date of Patent: October 29, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Minami Ishii, Takehiro Nakamura
  • Patent number: 8565809
    Abstract: An uplink radio resource allocation method allocates, at a radio base station, an uplink radio resource used for uplink user data transmission to a mobile station. The method includes: allocating, at the radio base station, the uplink radio resource, so that total received power in an particular cell of the radio base station is equal to a first target value assigned by a radio network controller; and allocating, at the radio station, the uplink radio resource, so that a ratio of first received power from a serving mobile station to second received power from a non-serving mobile station is equal to a second target value assigned by the radio network controller, a serving cell of the serving mobile station being the particular cell, a non-serving cell of the non-serving mobile station being the particular cell.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: October 22, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Anil Umesh, Masafumi Usuda, Takehiro Nakamura
  • Patent number: 8548477
    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: Grant
    Filed: February 4, 2009
    Date of Patent: October 1, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Wuri Andarmawanti Hapsari, Minami Ishii, Takehiro Nakamura
  • Publication number: 20130250017
    Abstract: A recording medium surface property modifying apparatus is disclosed. The recording medium surface property modifying apparatus includes a conveying unit which conveys a recording medium in a predetermined direction; a discharging electrode which rotates and comes into contact with a face to be treated of the recording medium which is conveyed by the conveying unit to cause the face to be treated to be in contact with plasma to modify a surface property of the recording medium; and a hollow-shaped cover member which covers a plasma treatment unit which includes the discharging electrode, the recording medium surface property modifying apparatus further including a humidity control unit which controls, in advance, humidity of the plasma treatment unit in alignment with acidity of the recording medium which undergoes the surface property modifying treatment.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Inventors: Haruki SAITOH, Hijiri Ogata, Takehiro Nakamura, Masaru Hoshina
  • Patent number: 8514720
    Abstract: A base station for communicating with a mobile station which transmits an uplink signal according to a frequency division multiplexing scheme includes a first measurement unit configured to measure reception power on a frequency band for the random access channel in uplink or a second measurement unit configured to measure the number of receptions of preambles on the random access channel. The base station may either control the frequency band for the random access channel or restrict transmission on the random access channel based on at least one of the reception power on the frequency band for the random access channel and the number of receptions of preambles on the random access channel.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: August 20, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiroyuki Ishii, Satoshi Nagata, Takehiro Nakamura, Mikio Iwamura
  • Patent number: 8504045
    Abstract: A radio base station (T-eNB) is configured to set up a data forwarding tunnel for forwarding user plane data to the radio base station (T-eNB) only for an access bearer for which the user plane data to be forwarded exists, when receiving a notification from a handover-source radio base station (S-eNB) as to whether or not the user plane data to be forwarded exists for each access bearer. The notification being made by using a handover request message for the mobile station (UE), and the access bearer being set up between the radio base station (T-eNB) and a upper level node (SGW).
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: August 6, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Wuri Andarmawanti Hapsari, Masayuki Motegi, Yasuhiro Kato, Yoshitsugu Shimazu, Takehiro Nakamura
  • Patent number: 8504049
    Abstract: A disclosed mobile communication system includes a newly-installed base station configured to send its identifier and a pilot channel; existing base stations; user devices configured to send reception quality measurements of the pilot channel to the existing base stations; and an upper node. Each of the existing base stations includes a statistical processing unit for performing statistical processing on the reception quality measurements; and a statistical processing result reporting unit configured to send a result of the statistical processing to the upper node. The upper node includes a tracking area selecting unit configured to select a tracking area to be assigned to the newly-installed base station based on the results of the statistical processing; and a tracking area reporting unit configured to report the selected tracking area to the newly-installed base station. The newly-installed base station includes a tracking area setting unit configured to set the reported tracking area.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: August 6, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mikio Iwamura, Takehiro Nakamura, Yasuhiro Kato, Wuri Andarmawanti Hapsari
  • Patent number: 8483228
    Abstract: The present invention relates to a channel allocating method for an IP multimedia subsystem which connects a radio access network and an IP network to provide voice communication and non-voice communication. In the channel allocating method according to the present invention, an enhanced dedicated channel is allocated to a channel for voice communication in a radio uplink, so as to improve a utilization efficiency of radio resources (hardware resources) and to prevent degradation of network capacity, in the channel for voice communication in the IMS.
    Type: Grant
    Filed: November 18, 2005
    Date of Patent: July 9, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8478274
    Abstract: A handover control apparatus includes a service determination unit determining a type of a service being communicated with by a mobile station and a handover processing unit performing handover in accordance with either a network initiative type handover procedure or a mobile station initiative type handover procedure based on the determination. If the service being communicated with by the mobile station belongs to a communication quality guaranteed type service, the handover is performed in accordance with the network initiative type handover procedure.
    Type: Grant
    Filed: July 4, 2006
    Date of Patent: July 2, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yasuhiro Kato, Hideaki Takahashi, Wuri Andarmawanti Hapsari, Takehiro Nakamura
  • Patent number: 8472404
    Abstract: A mobile communication method according to the present invention includes the steps of: (A) calculating, at the radio base station (eNB1), an estimated neighbor radio base station parameter, on a basis of load information acquired from a neighbor radio base station (eNB2), the estimated neighbor radio base station parameter being supposed to be used in the neighbor radio base station (eNB2); and (B) notifying, from the radio base station to (eNB1) the neighbor radio base station (eNB2), the estimated neighbor radio base station parameter.
    Type: Grant
    Filed: January 8, 2009
    Date of Patent: June 25, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Wuri Andarmawanti Hapsari, Mikio Iwamura, Takehiro Nakamura
  • Publication number: 20130143571
    Abstract: A disclosed base station apparatus to be used in a mobile communication system includes a report signal receiving unit, receiving a report signal from one or more user equipment terminals, a radio parameter adjustment unit adjusting radio parameters based on an analysis result of each report signal, a designation unit designating a report condition to be used for each user equipment terminal to determine whether to transmit the report signal and content to be reported in the report signal, and a report unit reporting the report condition and the content to be reported to the one or more user equipment terminals. Further, in the base station apparatus, the report condition is satisfied when a transmission source of a downlink reference signal is a specific cell, and the content to be reported includes a received quality value of the downlink reference signal.
    Type: Application
    Filed: January 4, 2013
    Publication date: June 6, 2013
    Inventors: Mikio Iwamura, Takehiro Nakamura, Yasuhiro Kato, Yoshitsugu Shimazu, Masayuki Motegi
  • Patent number: 8437755
    Abstract: The present invention relates to a transmission rate control method for controlling a transmission rate of user data transmitted from a mobile station to a radio base station, including: notifying, from a radio network controller to the radio base station, a transmission rate difference or a transmission rate ratio between a transmission rate of a mobile station performing a soft handover and a transmission rate of a mobile station not performing the soft handover, the soft handover performed between the mobile station and the radio base station under the radio network controller; and controlling, at the radio base station, the transmission rate of each mobile station according to the notified transmission rate difference or the notified transmission rate ratio.
    Type: Grant
    Filed: March 17, 2006
    Date of Patent: May 7, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Masafumi Usuda, Anil Umesh, Takehiro Nakamura
  • Patent number: 8428600
    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: Grant
    Filed: September 5, 2008
    Date of Patent: April 23, 2013
    Assignee: NTT DoCoMo, Inc.
    Inventors: Minami Ishii, Takehiro Nakamura
  • Publication number: 20130038053
    Abstract: A synthetic resin-made welding joint that has a pipe end portion into which an end portion of a synthetic resin-made tube is to be fitted and inserted, and that is configured so that the pipe end portion and the tube end portion which is fitted and inserted thereinto are enabled to be welded together by heating of heating means which externally surrounds the pipe end portion, therefore, a synthetic resin-made holder which is fitted and attached onto the pipe end portion is disposed, and a flange for ensuring a radial expansion gap with respect to the heating means is integrally formed in the holder.
    Type: Application
    Filed: April 1, 2011
    Publication date: February 14, 2013
    Applicant: NIPPON PILLAR PACKING CO., LTD.
    Inventors: Ryo Imanishi, Masaru Misaki, Masateru Yamada, Takehiro Nakamura, Akihiro Masuda