Patents by Inventor Tomoya OHARA

Tomoya OHARA 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: 20210037487
    Abstract: A terminal is disclosed including a receiver that receives synchronization blocks and an indication triggering contention free random access from a base station apparatus; a processor that identifies a synchronization block, a random access preamble and a random access channel occasion for use in the contention free random access based on the indication triggering contention free random access; and a transmitter that transmits the identified random access preamble to the base station apparatus by use of the identified synchronization block and the identified random access channel occasion. In other aspects, a base station apparatus is also disclosed.
    Type: Application
    Filed: February 15, 2018
    Publication date: February 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventor: Tomoya Ohara
  • Publication number: 20210037575
    Abstract: A terminal is disclosed including a receiver that receives control information that is a trigger for initiating a random access procedure; a processor that selects an occasion for transmitting a random access preamble; and a transmitter that transmits the random access preamble using the occasion, wherein the receiver receives a response to the random access preamble using a resource for monitoring control information for receiving the response to the random access preamble, by assuming quasi co-location not related to quasi co-location that is associated with the resource for monitoring the control information. In other aspects, a response reception method and a base station are also disclosed.
    Type: Application
    Filed: April 5, 2018
    Publication date: February 4, 2021
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200404703
    Abstract: A user apparatus receives an instruction to execute a random access procedure from a base station apparatus and includes a reception unit that receives first information specifying an available random access channel from the base station apparatus; a control unit that identifies, on the basis of the first information, a resource of the available random access channel in a time domain or a frequency domain; and a transmission unit that transmits a random access preamble using the identified resource.
    Type: Application
    Filed: February 20, 2018
    Publication date: December 24, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tooru Uchino, Tomoya Ohara, Hideaki Takahashi, Hiroki Harada
  • Publication number: 20200404595
    Abstract: A user equipment communicates with a base station using a first RAT and a second RAT, including: a transmission unit to perform uplink transmission using the first RAT and the second RAT; a control unit to, if a sum of transmission powers of the uplink transmission via the first RAT and the second RAT exceeds a predetermined maximum transmission power, reduce the transmission power of the uplink transmission via the second RAT. If the sum exceeds a maximum transmission power and the transmission unit fails to transmit random access preamble via the second RAT and re-transmits the random access preamble, or if dynamic power sharing is not supported and the random access preamble is not transmitted via the second RAT in a slot where an uplink transmission via the first RAT is scheduled, the control unit changes transmission power control for the re-transmitted random access preamble from normal control.
    Type: Application
    Filed: February 15, 2018
    Publication date: December 24, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Ryosuke Osawa
  • Publication number: 20200396770
    Abstract: User equipment for communicating with a base station via a radio frame includes a receiver to receive, from the base station, information indicating a downlink region or an uplink region, and information on a RACH configuration table indicating allocation of RACH resources associated with a time domain; a control unit to identify an available RACH resource, based on the information indicating a downlink region or an uplink region, and the information on the RACH configuration table; and a transmitter to transmit a preamble to the base station using the identified available RACH resource. The information indicating the downlink region or the uplink region includes an unknown region used for one of downlink and uplink, and availability of the RACH resource in the unknown region is explicitly or implicitly identified in case where the information on the RACH configuration table indicates that the RACH resource is allocated to the unknown region.
    Type: Application
    Filed: November 28, 2018
    Publication date: December 17, 2020
    Applicant: NTT DOCOMO, INC.
    Inventor: Tomoya Ohara
  • Publication number: 20200374837
    Abstract: In order to properly notify of resources in which a synchronization signal block is transmitted in the future radio communication system, a user terminal has a receiving section that receives pattern information indicating whether or not a synchronization signal block is transmitted in each of a plurality of transmission candidate positions within a group of transmission candidate positions of the synchronization signal block, and group information indicating a method of applying the pattern information to each of a plurality of groups, and a control section that controls, based on the group information, one of assuming that the synchronization signal block is transmitted in all transmission candidate positions within a particular group, and of determining the plurality of transmission candidate positions within the particular group according to the pattern information.
    Type: Application
    Filed: February 15, 2018
    Publication date: November 26, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Tomoya Ohara
  • Publication number: 20200367287
    Abstract: User equipment includes a receiver that communicates with a base station apparatus, and that receives, from the base station apparatus, one or more blocks associated with one or more beams transmitted from the base station apparatus, the one or more blocks including information used for initial access; a controller that selects a block used for determining a resource for transmitting a preamble from the one or more blocks, based on received power or reception quality of the one or more beams; and a transmitter that transmits the preamble to the base station apparatus using the resource.
    Type: Application
    Filed: August 9, 2017
    Publication date: November 19, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200359358
    Abstract: In one aspect of the present invention, user equipment includes a reception unit configured to detect a synchronization signal or a physical broadcast channel from a base station; a resource selection unit configured to select, from resources determined based on configuration information for preamble transmission, a resource for transmitting a preamble according to the detected synchronization signal or the detected physical broadcast channel based on a mapping rule, with a period determined based on at least one of a period of a synchronization signal burst set that is a duration during which the synchronization signal or the physical broadcast channel can be transmitted and a period of a resource available for transmission of the preamble; and a transmission unit configured to transmit the preamble to the base station on the selected resource.
    Type: Application
    Filed: January 11, 2018
    Publication date: November 12, 2020
    Applicant: NTT DOCOMO, INC.
    Inventor: Tomoya Ohara
  • Publication number: 20200344751
    Abstract: A terminal is disclosed that includes a transmitter that performs uplink transmission; and a processor that adjusts timing of the uplink transmission with respect to a downlink reception timing, wherein, when a band of a cell in which uplink transmission is performed is not a predetermined band, the processor adjusts the timing by using a same offset value when a duplex mode of the band of the cell is frequency division duplex (FDD) and when the duplex mode of the band of the cell is time division duplex (TDD). In other aspects, a base station and an uplink transmission timing adjustment method executed by the terminal are also disclosed.
    Type: Application
    Filed: January 12, 2018
    Publication date: October 29, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Tomoya Ohara
  • Publication number: 20200337090
    Abstract: A user apparatus in a radio communication system including a base station and the user apparatus, including: a transmission unit configured to transmit a preamble to the base station; and a reception unit configured to monitor a response for the preamble within a predetermined time window by using predetermined identification information, wherein the reception unit calculates the predetermined identification information using a system frame number.
    Type: Application
    Filed: November 27, 2018
    Publication date: October 22, 2020
    Applicant: NTT DOCOMO, INC.
    Inventor: Tomoya Ohara
  • Publication number: 20200288417
    Abstract: Measurement is efficiently performed while suppressing an increase in an overhead. A user terminal according to the present invention includes: a reception section that receives frequency information indicating a plurality of frequencies in a single component carrier; and a control section that, when a signal block including a synchronization signal and a broadcast signal is transmitted at each of the plurality of frequencies, controls measurement at the plurality of frequencies.
    Type: Application
    Filed: September 8, 2017
    Publication date: September 10, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Hiroki Harada, Tomoya Ohara, Daisuke Murayama, Satoshi Nagata
  • Publication number: 20200281017
    Abstract: A user apparatus communicates with a base station apparatus via a radio frame. The user apparatus includes a reception unit configured to receive information related to a RACH configuration table that indicates allocation of RACH resources in the time domain in the radio frame and information used for excluding unavailable RACH resources of the radio frame in the time domain, a control unit configured to identify available RACH resources based on the information related to the RACH configuration table and the information used for excluding unavailable RACH resources, and a transmission unit configured to transmit a preamble to the base station apparatus by using the identified available RACH resources.
    Type: Application
    Filed: November 16, 2017
    Publication date: September 3, 2020
    Applicant: NTT DOCOMO, INC.
    Inventor: Tomoya Ohara
  • Publication number: 20200281016
    Abstract: A RACH resource allocation scheme is disclosed. One aspect of the present invention relates to a base station including a RACH resource allocation unit that allocates a RACH band that includes random access channel (RACH) resource to which respective indexes are assigned in a frequency direction, and a random access (RA) processing unit that indicates a frequency position of the RACH resources to user equipment.
    Type: Application
    Filed: September 29, 2017
    Publication date: September 3, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200229236
    Abstract: A base station apparatus that communicates with a user apparatus is provided. The base station apparatus includes: a setting unit configured to arrange in a radio frame one or more blocks and information, the one or more blocks including information used for initial access, the information specifying resources that are associated with the blocks and are used for transmitting preambles; a transmission unit configured to transmit the radio frame to the user apparatus; and a reception unit configured to receive the preambles from the user apparatus via the resources. The information specifying the resource is set based on locations of the blocks arranged in the radio frame.
    Type: Application
    Filed: September 8, 2017
    Publication date: July 16, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200178307
    Abstract: A user equipment for communicating with a base station apparatus is disclosed, the user equipment including a receiver that receives information related to random access; a processor that identifies, based on the information related to the random access, a first preamble format, a second preamble format, and random access channel resources; a transmitter that transmits a random access preamble using the random access channel resources, wherein the transmitter transmits the random access preamble using a last resource in a time domain of the random access channel resources and the second preamble format, and the transmitter transmits the random access preamble using a resource other than the last resource in the time domain and the first preamble format. In other aspects, a base station apparatus and a communication method are also disclosed.
    Type: Application
    Filed: August 9, 2017
    Publication date: June 4, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200178306
    Abstract: A terminal is disclosed including a receiver that receives configuration information for random access. The terminal also includes a processor that determines a starting symbol position of a random access resource in one or more slots based on the configuration information. The terminal further includes a transmitter that transmits a preamble in a resource starting from the starting symbol position in the one or more slots. In other aspects, a preamble transmission method is also disclosed.
    Type: Application
    Filed: June 27, 2017
    Publication date: June 4, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20200154484
    Abstract: A terminal is disclosed including a processor and a transmitter. The processor selects one of a first table and a second table based on a frequency band, wherein the first table and the second table include candidate parameters that are used for random access. The transmitter transmits a preamble using the selected table.
    Type: Application
    Filed: May 2, 2017
    Publication date: May 14, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Patent number: 10630360
    Abstract: Provided is a communication device. The communication device communicating with another communication device, includes: a reception unit configured to receive a signal transmitted from the another communication device; a transmission unit configured to transmit a signal to the another communication device; and a control unit configured to determine a weighting vector to be used in the reception unit and a precoding vector to be used in the transmission unit, in which, in a case where a specific reference signal indicating that the weighting vector used for receiving the signal in the another communication device has been changed is received by the reception unit, the control unit determines the precoding vector to be used for signal transmission by performing channel estimation by using the received specific reference signal, and in which the transmission unit transmits data precoded with the precoding vector determined by the control unit.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: April 21, 2020
    Assignee: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada, Ryosuke Osawa
  • Publication number: 20200068597
    Abstract: User equipment for communicating with a base station using a secondary cell includes a transmitter that transmits, to the base station, a preamble to start a random access in the secondary cell; a receiver that receives, within a predetermined search space, scheduling information of a random access response to be transmitted, in response to the preamble, from the base station or another base station of a timing advance group including the base station, and that receives a random access response including uplink transmission timing information based on the scheduling information; and a transmission timing controller that controls uplink transmission timing based on the uplink transmission timing information included in the random access response.
    Type: Application
    Filed: May 2, 2017
    Publication date: February 27, 2020
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada
  • Publication number: 20190394809
    Abstract: Techniques for implementing proper transmission of RA preambles in a RA procedure are disclosed. An aspect of the present invention relates to a base station including a communication control unit configured to control radio communication with user equipment; and an RA procedure processing unit configured to perform a random access (RA) procedure with the user equipment, wherein the RA procedure processing unit indicates to the user equipment a maximum multiplexing number of RA preambles multiplexed into a radio resource capable of transmitting the RA preambles.
    Type: Application
    Filed: December 18, 2017
    Publication date: December 26, 2019
    Applicant: NTT DOCOMO, INC.
    Inventors: Tomoya Ohara, Hiroki Harada