Patents by Inventor Takashi Iwai

Takashi Iwai 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: 20200245326
    Abstract: It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method comprises the steps of setting a standard sequence with a standard sequence length and a standard sequence number in a step, setting a threshold value in accordance with an RB number in a step, setting a sequence length corresponding to RB number in a step, judging whether ¦r/N-rb/Nb¦=Xth(m) is satisfied in a step, including a plurality of Zadoff-Chu sequences with a sequence number and a sequence length in a sequence group in a step if the judgment is positive, and allocating the sequence group to the same cell in a step.
    Type: Application
    Filed: April 13, 2020
    Publication date: July 30, 2020
    Inventors: Takashi IWAI, Daichi IMAMURA, Tomofumi TAKATA, Yoshihiko OGAWA
  • Publication number: 20200245264
    Abstract: In a terminal (100), a PH calculator (105) calculates one or more power headrooms, each of which being calculated for each beam, and a radio transmitter (108) transmits the one or more power headrooms for a number of beams, the number being determined in accordance with a type of power headroom, or a trigger condition serving as a trigger for power headroom reporting.
    Type: Application
    Filed: August 10, 2017
    Publication date: July 30, 2020
    Inventors: Takashi IWAI, Lilei WANG, Hidetoshi SUZUKI, Tomofumi TAKATA, Ayako HORIUCHI
  • Publication number: 20200229001
    Abstract: In a terminal, a transmission power calculation unit calculates a transmission power of an uplink signal by using transmission power control information indicating one value from among a plurality of candidate values respectively associated with correction values that correct a control value to use in a closed loop control of the transmission power. A wireless transmission unit transmits the uplink signal with the above transmission power. A first correction value and a second correction value having a larger step size than the first correction value are associated with each of the plurality of candidate values.
    Type: Application
    Filed: August 22, 2018
    Publication date: July 16, 2020
    Inventors: TOMOHUMI TAKATA, TAKASHI IWAI, SHOTARO MAKI, YIHUI LI
  • 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
  • Patent number: 10716132
    Abstract: A wireless communication base station device, terminal device, and method have reduced signaling while maintaining high scheduling gain. A judgment unit pre-stores a correspondence between the number of code words and the number of clusters to reduce the maximum value for the number of clusters allocated to each terminal as the number of code words increases, and thus determines the maximum value for the number of clusters based on the number of code words acquired. Based on the number of code words for a transmission signal from a terminal, an estimated value for the reception quality, and the maximum value for the number of clusters that is output by the judgment unit, a scheduling unit schedules the allocation of the transmission signal transmitted by each terminal to a transmission band frequency (frequency resource) so as not to exceed the maximum value for the number of clusters.
    Type: Grant
    Filed: August 2, 2018
    Date of Patent: July 14, 2020
    Assignee: Sun Patent Trust
    Inventors: Yoshihiko Ogawa, Akihiko Nishio, Daichi Imamura, Seigo Nakao, Masayuki Hoshino, Takashi Iwai, Sadaki Futagi
  • Patent number: 10708954
    Abstract: A communication apparatus includes signal generation circuitry which, in operation, generates a control signal including a plurality of user specific fields, each of the plurality of user specific fields including an Association ID (AID) subfield for specifying a corresponding terminal station, and transmission circuitry which, in operation, transmits the control signal, wherein one of a plurality of AIDs for scheduled access or one of a plurality of random access IDs for random access is assigned to the AID subfield in each of the plurality of user specific fields, and each value of the plurality of random access IDs indicates a type of a terminal station which can perform random access to the at least one resource unit.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: July 7, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takashi Iwai, Tomohumi Takata, Yoshio Urabe
  • Publication number: 20200214048
    Abstract: A communication apparatus includes signal generation circuitry which, in operation, generates a control signal including a plurality of user specific fields, each of the plurality of user specific fields including an Association ID (AID) subfield for specifying a corresponding terminal station, and transmission circuitry which, in operation, transmits the control signal, wherein one of a plurality of AIDs for scheduled access or one of a plurality of random access IDs for random access is assigned to the AID subfield in each of the plurality of user specific fields, and each value of the plurality of random access IDs indicates a type of a terminal station which can perform random access to the at least one resource unit.
    Type: Application
    Filed: March 12, 2020
    Publication date: July 2, 2020
    Inventors: TAKASHI IWAI, TOMOHUMI TAKATA, YOSHIO URABE
  • Publication number: 20200205091
    Abstract: A radio communication apparatus is provided, which includes a receiver and a controller. The receiver, in operation, receives a first power headroom (PHR), which is obtained by subtracting a transmit power for a data channel from a maximum transmit power at a mobile station and which is transmitted from the mobile station, and receives a second PHR, which is obtained by subtracting the transmit power for the data channel and a transmit power for a control channel from the maximum transmit power at the mobile station and which is transmitted from the mobile station. The controller, in operation, selectively sets a simultaneous transmission of the data channel and the control channel in different frequency bands to be performed by the mobile station. When the data channel and the control channel are simultaneously transmitted in different frequency bands from the mobile station, the second PHR is obtained and transmitted from the mobile station.
    Type: Application
    Filed: March 2, 2020
    Publication date: June 25, 2020
    Inventors: Takashi Iwai, Akihiko Nishio, Daichi Imamura, Yoshihiko Ogawa, Atsushi Matsumoto
  • Patent number: 10687368
    Abstract: A sequence allocating method and apparatus wherein in a system where a plurality of different Zadoff-Chu sequences or GCL sequences are allocated to a single cell, the arithmetic amount and circuit scale of a correlating circuit at a receiving end can be reduced. In ST201, a counter (a) and a number (p) of current sequence allocations are initialized, and in ST202, it is determined whether the number (p) of current sequence allocations is coincident with a number (K) of allocations to one cell. In ST203, it is determined whether the number (K) of allocations to the one cell is odd or even. If K is even, in ST204-ST206, sequence numbers (r=a and r=N?a), which are not currently allocated, are combined and then allocated. If K is odd, in ST207-ST212, for sequences that cannot be paired, one of sequence numbers (r=a and r=N?a), which are not currently allocated, is allocated.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: June 16, 2020
    Assignee: Panasonic Corporation
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto
  • Publication number: 20200186301
    Abstract: In a terminal, based on a first parameter included in each of a plurality of downlink control signals, the first parameter indicating a cumulative count of code block groups (CBGs) configuring each of a plurality of transport blocks (TBs) assigned by the plurality of downlink control signals, a HARQ-ACK generation unit generates a response signal (HARQ-ACK) for each of the code block groups. A transmission unit collectively transmits the response signals for each of the code block groups.
    Type: Application
    Filed: May 7, 2018
    Publication date: June 11, 2020
    Inventors: TOMOYA NUNOME, AYAKO HORIUCHI, TAKASHI IWAI, HIDETOSHI SUZUKI
  • Patent number: 10681650
    Abstract: A base station includes a transmitter which transmits an offset value for a transmission power of a sounding reference signal (SRS) to a terminal apparatus; and a receiver which receives the SRS at the transmission power controlled by the terminal apparatus. The offset value used to control the transmission power is set within one of a first offset setting range having a first lower limit value and a first upper limit value and a second offset setting range having a second lower limit value and a second upper limit value. A difference between the first and second lower limit values equals a difference between the first and second upper limit values. A step width of the offset values within the first offset setting range equals a step width of the offset values within the second offset setting range. The SRS is a periodic SRS (P-SRS) or an aperiodic SRS (A-SRS).
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: June 9, 2020
    Assignee: Sun Patent Trust
    Inventors: Takashi Iwai, Daichi Imamura, Masayuki Hoshino, Akihiko Nishio, Takashi Tamura, Kazuki Takeda
  • Publication number: 20200170049
    Abstract: A user terminal apparatus includes a receiver to receive a control information value belonging to a set of multiple control information values. Each control information value in the set of multiple control information values is associated with a subset of random access sequences from multiple subsets of random access sequences. Different ones of the multiple subsets of random access sequences are associated with different amounts of data. A data processor selects a random access sequence from one of the subset of random access sequences based on the control information value. A transmitter transmits the selected random access sequence.
    Type: Application
    Filed: January 29, 2020
    Publication date: May 28, 2020
    Inventors: Daichi Imamura, Sadaki Futagi, Atsushi Matsumoto, Takashi Iwai, Tomofumi Takata
  • Patent number: 10667263
    Abstract: Disclosed are a wireless communication base station device and a division number determination method that improve 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: Grant
    Filed: August 2, 2018
    Date of Patent: May 26, 2020
    Assignee: Sun Patent Trust
    Inventors: Yoshihiko Ogawa, Seigo Nakao, Daichi Imamura, Akihiko Nishio, Masayuki Hoshino, Katsuhiko Hiramatsu, Kenichi Miyoshi, Yasuaki Yuda, Sadaki Futagi, Takashi Iwai
  • Patent number: 10666410
    Abstract: Provided is a radio communication base station device which can suppress a use amount of an SRS communication resource. In this device, a correlation rule setting unit (102) sets a rule for correlating a preamble with an SRS transmission time interval so that the preamble transmission time band and the SRS transmission time band are in the same transmission time band. An SRS transmission band decision unit (103) decides a time interval of a transmission time band which can transmit the SRS according to the preamble transmission time interval inputted from a preamble transmission band decision unit (101) and the correlation rule setting unit (102).
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: May 26, 2020
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Takashi Iwai, Daichi Imamura, Tomofumi Takata, Atsushi Matsumoto, Yoshihiko Ogawa, Sadaki Futagi
  • Publication number: 20200163027
    Abstract: A communication apparatus includes: signal generation circuitry which, in operation, generates a control signal including a target reception power value regarding a target value of a reception power for the communication apparatus to receive an uplink (UL) response frame transmitted by each of one or more terminal stations, the control signal being a trigger frame that solicits transmission of the UL response frame from each of the one or more terminal stations; and transmission circuitry which, in operation, transmits the generated signal.
    Type: Application
    Filed: January 8, 2020
    Publication date: May 21, 2020
    Inventors: TOMOHUMI TAKATA, YOSHIO URABE, TAKASHI IWAI
  • Publication number: 20200163072
    Abstract: Provided are a radio transmission apparatus and a radio transmission method whereby the increase of number of signaling bits can be suppressed and further the flexibility of frequency scheduling can be improved. A notified RBG calculating unit (203) that adds a predetermined offset value of “1” or “?1” to one of the start RBG number and the end RBG number of allocated RBG number information (b?i) output by a scheduling unit (201), thereby calculating notified RBG number information (bi). An RBG total number setting unit (204) calculates the total number of RBGs, which is to be notified, by adding “1” to the total number of allocated RBGs. A notified information generating unit (205) applies the notified RBG number information (bi) and the notified total number of RBGs (Nrb?) to a predetermined formula, thereby generating and transmitting, to terminals, notified information (r).
    Type: Application
    Filed: January 21, 2020
    Publication date: May 21, 2020
    Inventors: Takashi Iwai, Daichi Imamura, Akihiko Nishio, Yoshihiko Ogawa, Shinsuke Takaoka
  • Patent number: 10660092
    Abstract: It is an object to provide a sequence allocating method that, while maintaining the number of Zadoff-Chu sequences to compose a sequence group, is configured to make it possible to reduce correlations between different sequential groups. This method includes the steps of setting a standard sequence with a standard sequence length (Nb) and a standard sequence number (rb) in a step (ST101), setting a threshold value (Xth(m)) in accordance with an RB number (m) in a step (ST103), setting a sequence length (N) corresponding to RB number (m) in a step (ST104), judging whether ¦r/N?rb/Nb¦=Xth(m) is satisfied in a step (ST106), including a plurality of Zadoff-Chu sequences with a sequence number (r) and a sequence length (N) in a sequence group (rb) in a step (ST107) if the judgment is positive, and allocating the sequence group (rb) to the same cell in a step (ST112).
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: May 19, 2020
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Takashi Iwai, Daichi Imamura, Tomofumi Takata, Yoshihiko Ogawa
  • Publication number: 20200146052
    Abstract: In an AP (100), a Trigger frame generator (104) generates a trigger signal instructing an uplink signal transmission, the trigger signal including a terminal information field that includes a terminal ID subfield and a resource unit allocation information subfield, and a radio transmitter/receiver (106) transmits the trigger signal. In a case where the trigger signal includes a first terminal information field specifying one or more contiguous resource units for random access, the Trigger frame generator (104) sets an unused ID that is not to be used as a terminal ID in the first terminal information field.
    Type: Application
    Filed: February 6, 2018
    Publication date: May 7, 2020
    Inventors: TAKASHI IWAI, YOSHIO URABE, TOMOHUMI TAKATA
  • Patent number: 10645707
    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: Grant
    Filed: November 1, 2018
    Date of Patent: May 5, 2020
    Assignee: Sun Patent Trust
    Inventors: Tomofumi Takata, Daichi Imamura, Seigo Nakao, Sadaki Futagi, Takashi Iwai, Yoshihiko Ogawa
  • Publication number: 20200128545
    Abstract: A scheduling apparatus and a scheduling method, wherein the amount of signaling for frequency resource allocation information can be reduced while maintaining system throughput performance. In a base station apparatus, a scheduling section allocates frequency resources to frequency allocation target terminals based on set frequency allocation units, and a frequency allocation parameter setting section adjusts the set frequency allocation units set in the scheduling section based on cluster numbers. Due to this, in each cluster number, frequency resources can be allocated based on the most suitable frequency allocation units with respect to the signaling bit number. As a result, the amount of signaling for frequency resource allocation information can be reduced. Further, system throughput can be maintained by making the cluster number, which is a parameter having little effect on system throughput, a setting parameter for frequency allocation units.
    Type: Application
    Filed: December 17, 2019
    Publication date: April 23, 2020
    Inventors: Takashi Iwai, Sadaki Futagi, Daichi Imamura, Akihiko Nishio, Seigo Nakao, Yoshihiko Ogawa