Patents by Inventor Naoto Ookubo

Naoto Ookubo 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: 20130288738
    Abstract: In order to make transmission power control of a PDCCH signal in an appropriate manner in a communication system having a system band formed with a plurality of fundamental frequency blocks, the present invention provides a radio base station apparatus having: a transmitting section configured to transmit downlink control channel signals for respective fundamental frequency blocks to a mobile terminal apparatus; and a receiving section configured to receive retransmission response signals that are transmitted in a predetermined fundamental frequency block from the mobile terminal apparatus.
    Type: Application
    Filed: October 3, 2011
    Publication date: October 31, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Naoto Ookubo, Hiroyuki Ishii, Nobuhiko Miki
  • Publication number: 20130286996
    Abstract: To efficiently detect feedback control information on downlink shared data channel signals transmitted with a plurality of base frequency blocks also in the case of performing radio communications with a system band comprised of a plurality of base frequency blocks, it is a feature to have detecting sections (208, 210) configured to detect a correlation value between an ACK/NACK signal received in uplink and each of ACK/NACK candidate replicas associated with ACK and NACK in response to a downlink shared data channel signal of a particular base frequency block assigned to the mobile terminal apparatus among a plurality of base frequency blocks or of each of a plurality of base frequency blocks, and an A/N·DTX determining section (211) configured to determine feedback control information on the downlink shared data channel signal of the particular base frequency block or of each of the plurality of base frequency blocks, based on the detected correlation value and a DTX determination threshold value.
    Type: Application
    Filed: October 3, 2011
    Publication date: October 31, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Naoto Ookubo, Tetsushi Abe, Yoshihisa Kishiyama
  • Publication number: 20130279440
    Abstract: To prevent a situation that communication operation becomes unstable resulting from erroneous detection of a PDCCH in a mobile communication system having a system band comprised of a plurality of base frequency blocks, in a mobile terminal apparatus (10) provided with a downlink control signal decoding section (104) configured to determine radio resources designated by ARI (ACK/NACK Resource Indicator) fields of PDSCHs assigned to a plurality of base frequency blocks (CCs), and a retransmission response signal transmission control section (105) configured to control transmission of retransmission response signals in response to PDSCHs assigned to a plurality of base frequency blocks (CCs) based on the radio resources designated by the ARI fields, the retransmission response signal transmission control section (105) limits transmission of retransmission response signals in response to PDSCHs assigned to all the base frequency blocks (CCs) when the radio resources designated by a plurality of the ARI fields in
    Type: Application
    Filed: October 3, 2011
    Publication date: October 24, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Hiroyuki Ishii, Tetsushi Abe, Yoshihisa Kishiyama, Kazuaki Takeda
  • Publication number: 20130244681
    Abstract: A base station that performs radio communication with a mobile station includes an index calculation unit that calculates an index representing interference in a frequency band, wherein the frequency band is to be utilized by a different base station; a frequency band selection unit that selects the frequency band based on the index calculated by the index calculation unit, wherein, in the frequency band, the interference is less than or equal to a predetermined threshold value; and a communication unit that performs the radio communication with the mobile station in the frequency band selected by the frequency band selection unit.
    Type: Application
    Filed: October 24, 2011
    Publication date: September 19, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Kohei Kiyoshima, Hiroyuki Ishii, Sadayuki Abeta, Takeshi Okamoto
  • Publication number: 20130237224
    Abstract: A base station includes a connection processing unit that performs connection processes between user terminals registered in a user terminal registration unit and the base station, and between user terminals other than the user terminals registered in the user terminal registration unit and the base station; a resource amount measurement unit that measures an amount of resources utilized by the base station; and a call disconnection user terminal selecting unit that selects, when the resource amount measurement unit measures that the amount of the resources is greater than or equal to a predetermined threshold value, the user terminal for which a call is to be disconnected, among the user terminals other than the user terminals registered in the user terminal registration unit. The connection processing unit disconnects a connection with the user terminal for which the call is to be disconnected.
    Type: Application
    Filed: December 21, 2011
    Publication date: September 12, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Kosuke Fujino, Kazunori Obata, Seigo Harano, Tadashi Uchiyama, Hiroyuki Ishii, Naoto Ookubo
  • Publication number: 20130237235
    Abstract: A mobile communication method according to the present invention includes a step A of notifying, by a radio base station eNB, a mobile station UE during communication in a subordinate cell #1 of “CSI-RS/Muting configuration information” indicating a transmission method of CSI-RS; and a step B of performing, by the mobile station UE, a reception process on the basis of the “CSI-RS/Muting configuration information”.
    Type: Application
    Filed: November 18, 2011
    Publication date: September 12, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Satoshi Nagata, Tetsushi Abe, Naoto Ookubo, Mikio Iwamura
  • Publication number: 20130229958
    Abstract: The base station includes a scheduler controller that controls scheduling operations of a downlink and an uplink. The scheduler controller controls the scheduling operation of the DL and the UL in accordance with a first criterion such that a subframe of user equipment which includes UL data starts, prior to termination of a subframe of base station not including DL data, a second criterion such that the subframe of the user equipment which does not include the UL data starts, prior to the termination of the subframe of the base station including the DL data, or a third criterion such that the subframe of the user equipment which includes a signal other than an ACK/NACK starts, prior to the termination of the subframe of the base station including the DL data.
    Type: Application
    Filed: November 28, 2011
    Publication date: September 5, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Yuta Sagae, Hiroyuki Ishii, Naoto Ookubo, Anil Umesh
  • Publication number: 20130223266
    Abstract: When a cell in a first system which follows a transmission loss to control an uplink transmit power neighbors a cell in a second system which follows channel fading to control an uplink transmit power, a quality of an uplink signal in the cell in the first system is maintained.
    Type: Application
    Filed: October 6, 2011
    Publication date: August 29, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Yoshikazu Goto, Naoto Ookubo
  • Publication number: 20130225160
    Abstract: A base station of a mobile communication system includes a receiver that receives capability information including information regarding plural frequencies which are measurable by the user equipment; an identifying unit that identifies, subsequent to allocation of radio resources to the user equipment, one or more different frequencies which are measurable by the user equipment and different from a frequency of a serving cell, among the plural frequencies in the capability information; and a transmitter that transmits a different frequency measurement command signal for commanding the user equipment to measure the identified one or more different frequencies or all the different frequencies, which are measurable by the user equipment, to the user equipment. The receiver receives a report signal indicating presence or absence of coverage for each of the one or more different frequencies from the user equipment that performs the measurement in response to the different frequency measurement command signal.
    Type: Application
    Filed: December 21, 2011
    Publication date: August 29, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Kosuke Fujino, Kazunori Obata, Hiroyuki Ishii, Naoto Ookubo
  • Publication number: 20130171991
    Abstract: A base station includes a call connection acceptance determination unit that determines, when a call connection request signal from the user terminal is received, whether a call connection request from the user terminal is acceptable, based on an amount of resources that is used by the base station; a redirection-setting unit that sets, when the call connection acceptance determination unit determines that the call connection request from the user terminal is not to be accepted, a different base station to which the user terminal is to be redirected; and a notification unit that reports information representing the different base station that is set by the redirection-setting unit to the user terminal.
    Type: Application
    Filed: December 21, 2011
    Publication date: July 4, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Kosuke Fujino, Kazunori Obata, Seigo Harano, Tadashi Uchiyama, Hiroyuki Ishii, Naoto Ookubo
  • Publication number: 20130091426
    Abstract: To present information that is likely to be input by a user as an input candidate in a case of supporting user input. A communication terminal acquires an email, when an instruction to generate a memorandum is detected, specifies a character string associated with a predetermined attribute (a date and time, place, and person etc.), selects an input candidate from the specified character string and presents the selected candidate. For example, when a receive time of the email is “March 10th,” and the email includes the character string “next day” in the text, the communication terminal presents the character string “March 11th” as an input candidate.
    Type: Application
    Filed: May 9, 2011
    Publication date: April 11, 2013
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoki Hashida, Yuma Kuribayashi, Naoto Ookubo, Chisa Takeda, Junko Hiraishi