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: 20190182822
    Abstract: The present invention provides a method for allowing user terminal to acquire information about paging physical resource blocks (PRBs), a method of allowing a base station to indicate information about paging PRBs to UE, a method of allowing UE to determine allocation of paging PRBs, a method of allowing a base station to allocate paging PRBs, a base station and UE. The above method of allowing user terminal to acquire information about paging physical resource blocks (PRBs) includes detecting an anchor PRB, reading information carried by the anchor PRB, and acquiring information about the non-anchor paging PRBs associated with the anchor PRB based on the information carried by the anchor PRB. By this method, non-anchor paging PRBs can be specified to the UE.
    Type: Application
    Filed: August 10, 2017
    Publication date: June 13, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Naoto Ookubo, Jiahui Liu, Qin Mu, Liu Liu, Huiling Jiang
  • Publication number: 20190149984
    Abstract: The present invention provides a method for configuring a hybrid automatic repeat request (HARQ) mode in a base station, a communication method for use by user terminal supporting communication capabilities of the first type, a base station and user terminal. This user terminal includes a transmission section that transmits information about a capability for supporting HARQ bundling, to a radio base station, and the transmission section transmits bundled HARQ-ACKs to the radio base station based on the capability.
    Type: Application
    Filed: August 10, 2017
    Publication date: May 16, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Satoshi Nagata, Naoto Ookubo, Qin Mu, Liu Liu, Huiling Jiang
  • Publication number: 20190132094
    Abstract: Provided is a communication system that can sustain a reduction in delay in FFT/IFFT processing by code blocking user data, even in a case where the functions of upper layers such as a MAC scheduler and the function of the radio physical layer are implemented separately. In a radio base station (communication system) including a central aggregation device 210 and a remote device 220, the central aggregation device 210 transmits code blocks in a number necessary for generating an OFDM symbol as a piece of data to the remote device 220, the code blocks being produced by dividing user data into units of encoding processing.
    Type: Application
    Filed: February 28, 2017
    Publication date: May 2, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Naoto Ookubo, Anil Umesh
  • Publication number: 20190124519
    Abstract: An extension station in a wireless base station including the extension station and a central aggregation station includes: an acquisition unit configured to acquire measurement resource information from the central aggregation station; a measurement unit configured to measure interference wave power of a radio resource indicated by the measurement resource information; and a transmission unit configured to transmit a measurement result of the interference wave power measured by the measurement unit to the central aggregation station. The measurement resource information is information indicating a radio resource of which uplink interference wave power is to be measured.
    Type: Application
    Filed: February 22, 2017
    Publication date: April 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Takahiro Takiguchi, Naoto Ookubo, Takayuki Isogawa, Tooru Uchino
  • Publication number: 20190124629
    Abstract: One object is to provide a radio base station and a communication control method in which a remote device can correctly transmit downlink data based on radio resource assignment information from a central aggregation device even when a function of an upper layer such as MAC scheduler and a function of a radio physical layer are mounted separately. The method includes transmitting including a central aggregation device (210) of a radio base station transmitting to a remote device (260) a frame containing each of assignment information indicating radio resource assignment and downlink data that is data transmitted to a user device (300), and transmitting including the remote device (260), based on the received frame, transmitting the assignment information to the user device (300) via PDCCH and transmitting the downlink data to the user device (300) via DLSCH.
    Type: Application
    Filed: February 13, 2017
    Publication date: April 25, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Anil Umesh, Naoto Ookubo
  • Publication number: 20190116514
    Abstract: A radio base station is disclosed including an extension station and a central aggregate station, wherein the extension station includes a processor that determines whether a resource used when a user equipment transmits an uplink reference signal is allocated, a first receiver that receives the uplink reference signal from the user equipment based on a determination result of processor, wherein the processor calculates measurement information based on the uplink reference signal received by the first receiver, and a transmitter that transmits the measurement information calculated by the processor to the central aggregate station, and the central aggregate station includes a receiver that receives the measurement information from the extension station.
    Type: Application
    Filed: March 30, 2017
    Publication date: April 18, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Takayuki Isogawa, Tooru Uchino
  • Publication number: 20190116524
    Abstract: An interface method between a central-aggregate apparatus and an extension apparatus is provided, which includes: transmitting, by the central-aggregate apparatus, uplink signal indication information for a user equipment and an identifier of the user equipment to the extension apparatus; retaining, by the extension apparatus, the identifier and uplink signal information extracted from the received uplink signal indication information and transmitting an uplink signal indication to the user equipment; receiving an uplink signal transmitted from the user equipment based on one or both of the retained uplink signal information and identifier; extracting data information from the uplink signal, estimating uplink communication quality based on the uplink signal, and transmitting one or both of the extracted data information and the estimated uplink communication quality to the central-aggregate apparatus; and receiving, by the central-aggregate apparatus, one or both of the data information and the uplink communi
    Type: Application
    Filed: March 24, 2017
    Publication date: April 18, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Takayuki Isogawa, Naoto Ookubo, Takahiro Takiguchi, Tooru Uchino
  • Publication number: 20190110275
    Abstract: The communication control method includes transmitting including a central aggregation device (210) of a radio base station transmitting to a remote device (260) system information (SIB) that is notified to a user device (300) and assignment information indicating radio resource assignment used for notifying the system information, and transmitting including the remote device (260) transmitting the system information to the user device (300) via a predetermined downlink channel based on received assignment information. The transmitting the assignment information to the remote device (260) includes, when the contents of the system information or the assignment information is changed, transmitting the contents changed system information or the contents changed assignment information.
    Type: Application
    Filed: April 5, 2017
    Publication date: April 11, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Wuri Andarmawanti Hapsari, Anil Umesh, Naoto Ookubo, Tooru Uchino
  • Publication number: 20190110305
    Abstract: A communication control method according to the present invention is implemented in a radio base station (200) including a remote device (260) and a central aggregation device (210) and that performs radio communication with a user device (300). The communication method includes acquiring including the remote device (260) acquiring via a predetermined uplink channel downlink quality information indicating radio communication quality in downlink acquired by the user device (300); transmitting including the remote device (260) transmitting to the central aggregation device (210) a quality data series containing one or more pieces of the downlink quality information acquired at the acquiring; and performing including the central aggregation device (210) performing assignment of a radio resource to the user device (300) based on the quality data series.
    Type: Application
    Filed: February 28, 2017
    Publication date: April 11, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Kohei Kiyoshima, Anil Umesh, Tooru Uchino, Kazuki Takeda
  • Publication number: 20190089505
    Abstract: Provided is a base station used as a first base station in a radio communication system including the first base station, a second base station communicating with the first base station, and a user equipment communicating with the first base station. The base station includes: an acquiring unit that acquires a plurality of parameters used for an initial cell setting; and a setting unit that performs a cell setting using the acquired plurality of parameters.
    Type: Application
    Filed: March 23, 2017
    Publication date: March 21, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Wuri Andarmawanti Hapsari, Naoto Ookubo, Tooru Uchino, Anil Umesh
  • Publication number: 20190075560
    Abstract: A base station is provided that includes an obtainer that obtains a first parameter used for generation of a signal of a physical downlink control format indicator channel, a second parameter used for generation of a signal of a physical downlink HARQ indicator channel, or a third parameter used for generation of a signal of a physical downlink control channel; a generator that generates the signal of the physical downlink control format indicator channel, the signal of the physical downlink HARQ indicator channel, or the signal of the physical downlink control channel using the first parameter, the second parameter, or the third parameter; and a transmitter that transmits the generated signal of the physical downlink control format indicator channel, the generated signal of the physical downlink HARQ indicator channel, or the generated signal of the physical downlink control channel.
    Type: Application
    Filed: March 16, 2017
    Publication date: March 7, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Takahiro Takiguchi, Naoto Ookubo, Anil Umesh, Tooru Uchino
  • Publication number: 20190021060
    Abstract: The communication control method according to the present invention is performed in a radio base station (200) that includes a remote device (260) and a central aggregation device (210), and that performs radio communication with a user device (300). The communication control method includes acquiring including the remote device (260) acquiring predetermined information necessary to perform a transmission power control of an uplink signal transmitted from the user device (300); transmitting including the remote device (260) transmitting to the central aggregation device (210) the acquired predetermined information; receiving including the central aggregation device (210) receiving the predetermined information; and processing includes the central aggregation device (210) processing, based on the received predetermined information, TPC information that causes the user device (300) to perform the transmission power control.
    Type: Application
    Filed: January 18, 2017
    Publication date: January 17, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Takayuki Isogawa, Naoto Ookubo, Takahiro Takiguchi, Anil Umesh, Tooru Uchino, Kazuki Takeda
  • Publication number: 20180323931
    Abstract: A base station according to an embodiment is provided. The base station communicates with a user apparatus in an LTE-supported wireless communication system. The base station includes a generation unit configured to generate a signal in which a UE specific reference signal is mapped according to a first pattern in which, in a range of resource elements enclosed by a segment in the time direction indicated by a predetermined subframe in which a synchronization signal is mapped and by a segment in the frequency direction in which the synchronization signal is mapped, a UE specific reference signal is mapped onto a resource element other than a resource element onto which the synchronization signal is mapped; and a transmission unit configured to transmit the generated signal.
    Type: Application
    Filed: November 8, 2016
    Publication date: November 8, 2018
    Applicant: NTT DOCOMO, INC.
    Inventors: Kohei Kiyoshima, Naoto Ookubo, Sadayuki Abeta, Satoshi Nagata, Hiroki Harada
  • Publication number: 20180249366
    Abstract: There is provided a user apparatus of a radio communication system provided with a base station and the user apparatus, the user apparatus including a determination unit configured to determine a size of a soft buffer to be secured within the user apparatus based on a total soft buffer size corresponding to a UE category of the user apparatus, a modulation scheme configured for a downlink by the base station, and a MIMO-layer number configured for the downlink by the base station; and a receiving unit configured to store data received from the base station in the soft buffer with the size determined by the determination unit, wherein the UE category includes 2 layers, 4 layers, and 8 layers as maximum MIMO-layer numbers to be supported, and the UE category includes 64 QAM and 256 QAM as the modulation schemes to be supported.
    Type: Application
    Filed: July 3, 2017
    Publication date: August 30, 2018
    Applicant: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Naoto Ookubo, Kazuaki Takeda
  • Patent number: 9590777
    Abstract: A base station 100 includes a scheduling processing unit 109 configured to schedule each of multiple mobile stations to the PDCCH, and a UE-type judgment unit 107 configured to judge whether each of the mobile stations is an OLD UE supporting only CFI=1 to 3 or a NEW UE supporting CFI=1 to 4. The scheduling processing unit 109 schedules each of the multiple UEs to the PDCCH by use of any one of CFI=1 to 3 when UEs targeted to be scheduled to the PDCCH include an OLD UE.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: March 7, 2017
    Assignee: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Yoshiaki Ofuji
  • Patent number: 9521604
    Abstract: In order to transmit a paging to a user terminal with high quality, transmit a CSI-RS effectively and perform UL HARQ efficiently in HetNet, the present invention provides a radio communication method having the steps of: a micro base station which is arranged in a macro cell and forms a smaller micro cell than the macro cell, transmitting, to a user terminal, a signal having a CSI-RS subframe including a CSI-RS and a paging subframe including modification notification information indicating modification in system information and a control signal indicating not to measure a CSI-RS when the CSI-RS subframe and the paging subframe collide with each other; and the user terminal determining a CSI-RS subframe to measure the CSI-RS based on the control signal when the CSI-RS subframe and the paging subframe collide with each other.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: December 13, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Tetsushi Abe, Satoshi Nagata, Nobuhiko Miki, Naoto Ookubo
  • Patent number: 9489358
    Abstract: 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: Grant
    Filed: May 9, 2011
    Date of Patent: November 8, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Naoki Hashida, Yuma Kuribayashi, Naoto Ookubo, Chisa Takeda, Junko Hiraishi
  • Patent number: 9240926
    Abstract: A base station 100 maps the system information formed of multiple blocks (SIB) to predetermined regions of a downlink shared channel and transmits the mapped system information to the mobile station. The base station 100 includes: a system information transmission control unit 105 configured to divide each of the predetermined regions into a first half and a second half in a time direction; and a transmission data generation unit 111 configured to map the system information to at least one of the first half and the second half. The system information transmission control unit 105 switches positions of the first half and the second half in rotation every transmission timing of the predetermined regions on the shared channel.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: January 19, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Yoshiaki Ofuji, Naoto Ookubo
  • Patent number: 9232507
    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: Grant
    Filed: October 3, 2011
    Date of Patent: January 5, 2016
    Assignee: NTT DOCOMO, INC.
    Inventors: Kazuaki Takeda, Naoto Ookubo, Tetsushi Abe, Yoshihisa Kishiyama
  • Patent number: 9220021
    Abstract: A user apparatus transmits an uplink control signal to a base station apparatus using a single carrier scheme. The user apparatus includes: a unit configured to prepare acknowledgement information indicating positive acknowledgement or negative acknowledgement for a downlink data signal based on a result of demodulation of the downlink data signal; a unit configured to prepare channel state information indicating reception quality of a downlink reference signal; a unit configured to channel-code multiplexed control information in which the acknowledgement information and the channel state information are multiplexed to prepare the uplink control signal; and a unit configured to transmit the uplink control signal using dedicated resources different from resources for an uplink data signal.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: December 22, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Naoto Ookubo, Hiroyuki Ishii, Nobuhiko Miki, Kenichi Higuchi, Yoshihisa Kishiyama