Patents by Inventor Sadaki Futagi

Sadaki Futagi 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: 10517090
    Abstract: Disclosed are a sequence report method and a sequence report device for reducing a signaling amount for reporting a Zadoff-Chu sequence or a GCL sequence allocated for a cell. Indexes starting at 1 are correlated to different ZC sequences and are allocated for cells so that the indexes are continuous. When such ZC sequences are reported from BS to UE, a start index indicating the start of the continuous indexes is combined with the number of allocated sequences and they are reported as allocation sequence information by a report channel. The UE and the BS share the correlation between the ZC sequences and the indexes and the UE identifies a usable sequence number according to the correlation and the allocation sequence information reported from the BS.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: December 24, 2019
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto
  • Patent number: 10505668
    Abstract: Provided is a radio communication device which can suppress inter-code interference between an ACK/NACK signal and a CQI signal which are code-multiplexed. A diffusion unit (214) diffuses the ACK/NACK signal inputted from a judgment unit (208) by using a ZC sequence. A diffusion unit (219) diffuses the CQI signal by using a cyclic shift ZC sequence. By using a Walsh sequence, a diffusion unit (216) further diffuses the ACK/NACK signal which has been diffused by using the ZC sequence. A control unit (209) controls the diffusion unit (214), the diffusion unit (216), and the diffusion unit (219) so that the minimum value of the difference between the CQI signals from a plurality of mobile stations and a cyclic shift amount of the ACK/NACK signal is not smaller than the minimum value of the difference between the cyclic shift amounts of the ACK/NACK signals from the plurality of mobile stations.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: December 10, 2019
    Assignee: Optis Wireless Technology, LLC
    Inventors: Sadaki Futagi, Seigo Nakao, Daichi Imamura
  • Patent number: 10484952
    Abstract: Provided is a communication device, which is enabled to improve the throughput of a communication system by reducing the difference of a transmission power between an SCCH and an SDCH thereby to satisfy the required quality of a PAPR. In this device, an MCS selection unit (111) of a transmission unit (110) decides, with reference to a CQI lookup table, an MCS pattern (MCS1) of the SDCH, an MCS pattern (MCS2) of the SCCH and information (multiplex information) on multiplex positions on the time axes of those two channels, on the basis of the CQI information. On the basis of the MCS2 and the MCS1, encoding modulation units (112 and 113) perform encoding and modulating operations. According to the multiplex information, a channel multiplexing unit (114) time-division multiplexes the SCCH and the SDCH thereby to generate a transmission signal.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: November 19, 2019
    Assignee: Optis Wireless Technology, LLC
    Inventors: Sadaki Futagi, Daichi Imamura, Atsushi Matsumoto, Takashi Iwai
  • Publication number: 20190281637
    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: Application
    Filed: May 23, 2019
    Publication date: September 12, 2019
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto
  • Publication number: 20190230700
    Abstract: A radio communication base station device can efficiently obtain a multiuser diversity gain from frequency scheduling while reducing the amount of a reference signal occupying an uplink. In the device, a grouping section divides a plurality of RBs (Resource Blocks) into a plurality of RB groups. An RB group control unit performs a control to change the correspondence relationship between the RBs and the RB groups with time. When the grouping section divides the RBs into the RB groups, the RB control unit performs a control to change a combination of the RBs included in each of the RB groups with time. A scheduling section performs a scheduling of allocating each of a plurality of mobile stations to each of the RBs in each of the RB groups according to the reception quality of the reference signal.
    Type: Application
    Filed: April 4, 2019
    Publication date: July 25, 2019
    Inventors: Yoshihiko OGAWA, Daichi IMAMURA, Ayako HORIUCHI, Sadaki FUTAGI
  • Patent number: 10342049
    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 7, 2018
    Date of Patent: July 2, 2019
    Assignee: Panasonic Corporation
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto
  • Publication number: 20190199494
    Abstract: Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.
    Type: Application
    Filed: February 27, 2019
    Publication date: June 27, 2019
    Inventors: Takashi IWAI, Sadaki FUTAGI, Tomohumi TAKATA, Daichi IMAMURA, Yoshihiko OGAWA
  • Patent number: 10306668
    Abstract: A radio communication base station device can efficiently obtain a multiuser diversity gain from frequency scheduling while reducing the amount of a reference signal occupying an uplink. In the device, a grouping section divides a plurality of RBs (Resource Blocks) into a plurality of RB groups. An RB group control unit performs a control to change the correspondence relationship between the RBs and the RB groups with time. When the grouping section divides the RBs into the RB groups, the RB control unit performs a control to change a combination of the RBs included in each of the RB groups with time. A scheduling section performs a scheduling of allocating each of a plurality of mobile stations to each of the RBs in each of the RB groups according to the reception quality of the reference signal.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: May 28, 2019
    Assignee: Sun Patent Trust
    Inventors: Yoshihiko Ogawa, Daichi Imamura, Ayako Horiuchi, Sadaki Futagi
  • Publication number: 20190158213
    Abstract: A radio transmitting device and method enables reduction of an increase of CGI 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 is provided with one CQI table for the data channel and CQI tables for the control channel, and a table selecting MCS determining section 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: January 22, 2019
    Publication date: May 23, 2019
    Inventors: Sadaki Futagi, Daichi Imamura, Seigo Nakao, Tomofumi Takata
  • Patent number: 10263744
    Abstract: Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal (100), which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller (106) switches the reference signal formation method of a reference signal generator (107) between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit (105) adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: April 16, 2019
    Assignee: Sun Patent Trust
    Inventors: Takashi Iwai, Sadaki Futagi, Tomohumi Takata, Daichi Imamura, Yoshihiko Ogawa
  • Publication number: 20190075568
    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: November 1, 2018
    Publication date: March 7, 2019
    Inventors: Tomofumi Takata, Daichi Imamura, Seigo Nakao, Sadaki Futagi, Takashi Iwai, Yoshihiko Ogawa
  • Patent number: 10225042
    Abstract: A radio transmitting device and method enables reduction of an increase of CGI 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 is provided with one CQI table for the data channel and CQI tables for the control channel, and a table selecting MCS determining section 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: Grant
    Filed: August 29, 2017
    Date of Patent: March 5, 2019
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Sadaki Futagi, Daichi Imamura, Seigo Nakao, Tomofumi Takata
  • Patent number: 10148401
    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: August 8, 2017
    Date of Patent: December 4, 2018
    Assignee: Sun Patent Trust
    Inventors: Tomofumi Takata, Daichi Imamura, Seigo Nakao, Sadaki Futagi, Takashi Iwai, Yoshihiko Ogawa
  • Publication number: 20180343668
    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: Application
    Filed: August 2, 2018
    Publication date: November 29, 2018
    Inventors: Yoshihiko OGAWA, Akihiko NISHIO, Daichi IMAMURA, Seigo NAKAO, Masayuki HOSHINO, Takashi IWAI, Sadaki FUTAGI
  • Publication number: 20180343657
    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: Application
    Filed: August 2, 2018
    Publication date: November 29, 2018
    Inventors: Yoshihiko OGAWA, Seigo NAKAO, Daichi IMAMURA, Akihiko NISHIO, Masayuki HOSHINO, Katsuhiko HIRAMATSU, Kenichi MIYOSHI, Yasuaki YUDA, Sadaki FUTAGI, Takashi IWAI
  • Patent number: 10075957
    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: May 9, 2016
    Date of Patent: September 11, 2018
    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: 10075974
    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 dusters to reduce the maximum value for the number of dusters 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: September 7, 2017
    Date of Patent: September 11, 2018
    Assignee: Sun Patent Trust
    Inventors: Yoshihiko Ogawa, Akihiko Nishio, Daichi Imamura, Seigo Nakao, Masayuki Hoshino, Takashi Iwai, Sadaki Futagi
  • Publication number: 20180255588
    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: Application
    Filed: May 7, 2018
    Publication date: September 6, 2018
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto
  • Patent number: 10034309
    Abstract: A mobile station includes communication control circuitry that selects a preamble contained in a first Random Access Preamble group when a message size based on data available for transmission does not meet a first condition or when a value calculated based on a reference signal received power of downlink does not meet a second condition, a preamble contained in a second Random Access Preamble group when the message size based on data available for transmission meets the first condition and the value calculated based on the reference signal received power of downlink meets the second condition, and a preamble contained in the third Random Access Preamble group for a handover, independent of the message size based on data available for transmission and the value calculated based on the reference signal received power of downlink. The communication control circuitry also generates and transmits a selected preamble.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: July 24, 2018
    Assignee: Godo Kaisha IP Bridge 1
    Inventors: Takashi Iwai, Daichi Imamura, Sadaki Futagi, Atsushi Matsumoto, Tomofumi Takata
  • Patent number: 9992798
    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, 2016
    Date of Patent: June 5, 2018
    Assignee: PANASONIC CORPORATION
    Inventors: Daichi Imamura, Takashi Iwai, Kazunori Inogai, Sadaki Futagi, Atsushi Matsumoto