Patents by Inventor Seigo Nakao

Seigo Nakao 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: 10771217
    Abstract: A wireless base station apparatus and wireless terminal apparatus with a configuration which can prevent reductions in the accuracy of channel estimation when non-contiguous band transmission and SRS transmission are employed in an uplink line. In the base station apparatus (100), an allocation setting unit (106), which sets the reception band of an SRS at an SRS extraction unit (103) and sets the units of frequency allocation (RBG) at a CQI estimation unit (104) and allocation unit (105), matches the frequency position at the end of the SRS reception band to the frequency position at the end of any of the units of frequency allocation and sets the reception bandwidth of the reference signal to a natural number multiple of the bandwidth of the unit of frequency allocation.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: September 8, 2020
    Assignee: Sun Patent Trust
    Inventors: Takashi Iwai, Akihiko Nishio, Daichi Imamura, Seigo Nakao, Yoshihiko Ogawa
  • Publication number: 20200280401
    Abstract: The invention provides a base station that does not cause the number of blind decodings to be increased and further can prevent the flexibility of resource allocation from degrading. A search space setting unit sets search spaces each of which is constituted by one or more control channel elements (CCEs) and each of which is to be decoded in the terminals and each of which is defined by a plurality of to-be-decoded candidates. An allocating unit places, in one of the plurality of to-be-decoded candidates included in the search space, a control channel. The number of connections of CCEs constituting the to-be-decoded candidate is associated with the number of to-be-decoded candidates. The search space setting unit causes, in accordance with the control channel to be transmitted, the association of the number of connections of CCEs constituting the to-be-decoded candidate with the number of to-be-decoded candidates to differ.
    Type: Application
    Filed: May 15, 2020
    Publication date: September 3, 2020
    Inventors: Seigo Nakao, Akihiko Nishio, Ayako Horiuchi, Daichi Imamura
  • Publication number: 20200274636
    Abstract: A radio transmitting device and method enables reduction of an increase of CQI memories for the control channel and an improvement of the throughput of the data channel. When multiplex transmission through the control channel and the data channel is carried out and when adaptive modulation is applied to both channels, an MCS selecting section (108) is provided with one CQI table for the data channel and CQI tables for the control channel, and a table selecting MCS determining section (201) selects one of the tables depending on the transmission bandwidth of the terminal and determines the MCS of the control channel while looking up the selected CQI table.
    Type: Application
    Filed: May 11, 2020
    Publication date: August 27, 2020
    Inventors: Sadaki Futagi, Daichi Imamura, Seigo Nakao, Tomofumi Takata
  • Publication number: 20200274653
    Abstract: If repetition transmission is applied to a response signal for a downlink data signal and an uplink signal, the uplink signal is repeatedly transmitted using a certain number of consecutive subframes starting with a first subframe, at which the repetition transmission of the uplink signal starts, and the response signal is repeatedly transmitted using at least the certain number of consecutive subframes starting with a second subframe, at which the repetition transmission of the response signal starts. The first subframe is set to be the same as the second subframe.
    Type: Application
    Filed: May 11, 2020
    Publication date: August 27, 2020
    Inventors: TETSUYA YAMAMOTO, SEIGO NAKAO, HIDETOSHI SUZUKI, MASAYUKI HOSHINO
  • Patent number: 10750516
    Abstract: A reception processor receives the cell detection reference signals, each of the cell detection reference signals being transmitted from corresponding one of a plurality of cells. An RRM report generator generates measurement information indicating a measurement result of reception quality measured using the cell detection reference signal. A transmission processor transmits the measurement information. The cell detection reference signals are mapped to any one of a plurality of candidate resources, which is a part of a plurality of resources set for other reference signals in a subframe to which the cell detection reference signals are mapped.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: August 18, 2020
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Masayuki Hoshino, Ayako Horiuchi, Seigo Nakao
  • Publication number: 20200260466
    Abstract: A terminal capable of reducing the resource regions in an uplink component band without increasing signaling even if a plurality of acknowledgment signals to downlink data transmitted respectively in a plurality of downlink component bands are transmitted from one uplink component band.
    Type: Application
    Filed: April 29, 2020
    Publication date: August 13, 2020
    Inventors: Akihiko Nishio, Seigo Nakao
  • Patent number: 10743300
    Abstract: Provided are a base station, whereby the erroneous detection of control information can be reduced, thereby preventing the degradation of the system throughput. A base station maps a downstream allocation control information unit, which is addressed to a terminal, to a first resource region, which can be used for any of a downstream control channel region and a downstream data channel region, or to a second resource region, which can be used only for the downstream control channel, so as to transmit the downstream allocation control information unit. In the base station, a control unit establishes a scale of the PDCCH region, and a transmission region establishing unit establishes, on the basis of a scale value established by the control unit, a mapping region to which the DCI is mapped within the R-PDCCH region and the PDCCH region.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: August 11, 2020
    Assignee: Sun Patent Trust
    Inventors: Akihiko Nishio, Seigo Nakao, Ayako Horiuchi, Yasuaki Yuda, Sujuan Feng, Michael Einhaus
  • Patent number: 10743342
    Abstract: Provided are a terminal, a base station and a signal transmission control method whereby a response signal can be efficiently transmitted when the terminal receives downstream allocation control information via an R-PDCCH. An extraction unit receives downstream control information via one of a first downstream control channel, which is transmitted by use of one or more control channel elements (CCE) associated with an upstream control channel resource, and a second downstream control channel different from the first downstream control channel, and also receives data via a data channel. A control unit selects, from resources associated with CCE and from particular resources reported by a base station, an upstream control channel resource to be used in transmission of the response signal, and controls the transmission of the response signal.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: August 11, 2020
    Assignee: Sun Patent Trust
    Inventor: Seigo Nakao
  • Publication number: 20200252937
    Abstract: A wireless communication base station device which makes it possible to provide a base station, terminal and CCE allocation method capable of reducing the number of times blind decoding of a terminal is performed, without increasing the CCE block rate, even when a plurality of unit bands are set in a terminal. In this device, a search space setting section (103) sets in each of a plurality of unit bands a common search space in respect of a terminal which is communicating using the plurality of unit bands and other terminals, and sets in each of the plurality of unit bands an individual search space in respect of the terminal. An allocation section (106) allocates control information solely to CCEs within the common search spaces set in specified unit bands among the plurality of unit bands, or solely to CCEs within individual search spaces set in specified unit bands.
    Type: Application
    Filed: April 23, 2020
    Publication date: August 6, 2020
    Inventors: Akihiko NISHIO, Seigo NAKAO
  • Publication number: 20200252171
    Abstract: Provided is a radio communication device which can make Acknowledgement (ACK) reception quality and Negative Acknowledgement (NACK) reception quality to be equal to each other. The device includes: a scrambling unit (214) which multiplies a response signal after modulated, by a scrambling code “1” or “e?j(?/2)” so as to rotate a constellation for each of response signals on a cyclic shift axis; a spread unit (215) which performs a primary spread of the response signal by using a Zero Auto Correlation (ZAC) sequence set by a control unit (209); and a spread unit (218) which performs a secondary spread of the response signal after subjected to the primary spread, by using a block-wise spread code sequence set by the control unit (209).
    Type: Application
    Filed: April 21, 2020
    Publication date: August 6, 2020
    Inventors: Seigo Nakao, Daichi Imamura
  • Publication number: 20200252935
    Abstract: Disclosed are a wireless communication base station device and a division number determination method that improves the frequency diversity effect while maintaining channel estimation accuracy regardless of the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. A determination unit determines the number of divisions in the frequency domain of a transmission signal from a wireless communication terminal device. Here, the determination unit increases the number of divisions in the frequency domain of the transmission signal from the wireless communication terminal device as the number of pilot blocks included in the transmission signal increases. In addition, a scheduling unit schedules allocation to the frequency resources of the divided transmission signal according to the number of divisions determined by the determination unit.
    Type: Application
    Filed: April 20, 2020
    Publication date: August 6, 2020
    Inventors: Yoshihiko OGAWA, Seigo NAKAO, Daichi IMAMURA, Akihiko NISHIO, Masayuki HOSHINO, Katsuhiko HIRAMATSU, Kenichi MIYOSHI, Yasuaki YUDA, Sadaki FUTAGI, Takashi IWAI
  • Publication number: 20200252927
    Abstract: Repetitions of a control signal across a plurality of first subframes and a data signal allocated to a resource indicated by the control signal are received. Repetition of a response signal for the data signal across a plurality of second subframes is performed, and a transmission signal is generated by multiplying the response signals in the second subframes by, among a plurality of first sequences orthogonal to one another, components of one of the first sequences which is associated with the first subframes, respectively.
    Type: Application
    Filed: April 20, 2020
    Publication date: August 6, 2020
    Inventors: TETSUYA YAMAMOTO, SEIGO NAKAO, MASAYUKI HOSHINO
  • Publication number: 20200245308
    Abstract: Disclosed is a base station in which the frequency usage efficiency can be improved when the communication bandwidths are asymmetric in the uplink line and the downlink line. A base station can communicate by using a plurality of downlink unit bands and a smaller number of uplink unit bands. A control unit allocates uplink resource allocation information and downlink resource allocation information to a PDCCH which is arranged in each of the plurality of downlink unit bands, and allocates a response signal to the uplink line data to a PHICH which is arranged in the same number of downlink unit bands from the plurality of downlink unit bands as there are uplink unit bands. A transmit RF unit transmits the resource allocation information or the response signal.
    Type: Application
    Filed: April 16, 2020
    Publication date: July 30, 2020
    Inventors: Seigo Nakao, Akihiko Nishio, Daichi Imamura
  • Publication number: 20200245316
    Abstract: A wireless communication base station apparatus that allows the number of times of blind decodings at a mobile station to be reduced without increasing the overhead caused by notifying information. In this apparatus, a CCE allocation part allocates allocation information allocated to a PDCCH received from modulation parts to a particular one of a plurality of search spaces that is corresponding to a CCE aggregation size of the PDCCH. A placement part then places the allocation information in one of downstream line resources, reserved for the PDCCH, that is corresponding to the CCE of the particular search space to which the allocation information has been allocated. A radio transmission part then transmits an OFDM symbol, in which the allocation information has been placed, to the mobile station from an antenna.
    Type: Application
    Filed: April 13, 2020
    Publication date: July 30, 2020
    Inventors: Akihiko Nishio, Seigo Nakao
  • Publication number: 20200245241
    Abstract: Disclosed is a wireless communication base station device capable of reducing the power consumption of a terminal when broadband transmission is performed with only an uplink. With this device, a setting unit sets mutually different terminal IDs per a plurality of uplink unit bands for a terminal that communicates using a plurality of uplink unit bands and prescribed downlink unit bands which are fewer in number than the uplink unit bands; a control unit that respectively allocates resource allocation information per a plurality of uplink unit bands to a PDCCH arranged in a prescribed downlink unit band; and a PDCCH creation unit that creates a PDCCH signal by respectively masking the resource allocation information per a plurality of uplink unit bands with the terminal ID that has been set per a plurality of uplink unit bands.
    Type: Application
    Filed: April 16, 2020
    Publication date: July 30, 2020
    Inventors: Akihiko NISHIO, Seigo NAKAO, Yoshiko SAITO, Alexander GOLITSCHEK EDLER VON ELBWART
  • Publication number: 20200235880
    Abstract: Provided is a radio communication device which can separate propagation paths of antenna ports and improve a channel estimation accuracy even when using virtual antennas. The device includes: a mapping unit which maps a data signal after modulation to a virtual antenna and a virtual antenna; a phase inversion unit which inverts the phase of S0 transmitted from an antenna port in synchronization with a phase inversion unit between the odd-number slot and the even-number slot; the phase inversion unit which inverts the phase of R0 transmitted from the antenna port; a phase inversion unit which inverts the phase of S1 transmitted from an antenna port in synchronization with a phase inversion unit; and the phase inversion unit which inverts the phase of R1 transmitted from an antenna port.
    Type: Application
    Filed: April 3, 2020
    Publication date: July 23, 2020
    Inventors: Seigo Nakao, Masayuki Hoshino, Atsushi Sumasu, Katsuhiko Hiramatsu
  • Publication number: 20200236663
    Abstract: A PUCCH resource collision between a normal mode terminal and MTC coverage enhancement mode terminal is avoided. A terminal includes a receiving section that receives control information indicating assignment of downlink data, and the downlink data; and a transmitting section that transmits a response signal using a resource in a first resource group when the terminal is a first terminal to which repetition transmission is applied, and that transmits the response signal using a resource in a second resource group that is different from the first resource group, when the terminal is a second terminal to which the repetition transmission is not applied.
    Type: Application
    Filed: April 2, 2020
    Publication date: July 23, 2020
    Inventors: Tetsuya Yamamoto, Chi Gao, Hidetoshi Suzuki, Seigo Nakao
  • Publication number: 20200235831
    Abstract: Received Signal Strength Indicator (RSSI) is measured accurately even in a case where a discovery signal is transmitted. A receiver receives a plurality of subframes, at least one of which includes a discovery signal, and a measurer measures Reference Signal Reception Power (RSRP) using a first resource in which the discovery signal is mapped, measures RSSI using a second resource different from the first resource for which the discovery signal is mapped, and calculates Reference Signal Reception Quality (RSRQ) using RSRP and RSSI.
    Type: Application
    Filed: April 9, 2020
    Publication date: July 23, 2020
    Inventors: Ayako Horiuchi, Masayuki Hoshino, Seigo Nakao
  • Patent number: 10721028
    Abstract: The present disclosure provides wireless communication methods for repeated transmission of channels, and wireless communication devices therefor. In one embodiment, the gap between the starting subframe of a first channel and the starting subframe of a second channel is defined or configured. In another embodiment, Mx*W=M and Mx*n=N is satisfied, where Mx is the number of subframes reserved for the channel in one HARQ process, M is RTT for one HARQ process, W is a positive integer and represents the maximum number of HARQ processes transmitting the channel within M subframes, N is the gap between the starting subframes of the channel in two HARQ processes, and n is a positive integer. In yet another embodiment, time-frequency resources for the channel in different HARQ processes are different.
    Type: Grant
    Filed: January 16, 2019
    Date of Patent: July 21, 2020
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Chi Gao, Hidetoshi Suzuki, Masayuki Hoshino, Seigo Nakao
  • Publication number: 20200229200
    Abstract: It is possible to provide a radio communication terminal device and a radio transmission method which can improve reception performance of a CQI and a reference signal. A phase table storage unit stores a phase table which correlates the amount of cyclic shift to complex coefficients {w1, w2} to be multiplied on the reference signal. A complex coefficient multiplication unit reads out a complex coefficient corresponding to the amount of cyclic shift indicated by resource allocation information, from the phase table storage unit and multiplies the read-out complex coefficient on the reference signal so as to change the phase relationship between the reference signals in a slot.
    Type: Application
    Filed: March 31, 2020
    Publication date: July 16, 2020
    Inventors: Tomofumi Takata, Daichi Imamura, Seigo Nakao, Sadaki Futagi, Takashi Iwai, Yoshihiko Ogawa