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    DOPPLER SHIFT CORRECTION IN THREE-DIMENSIONAL NETWORK
    2.
    发明申请
    DOPPLER SHIFT CORRECTION IN THREE-DIMENSIONAL NETWORK 有权

    公开(公告)号：US20210083917A1

    公开(公告)日：2021-03-18

    申请号：US16959694

    申请日：2018-12-21

    Applicant: SoftBank Corp.

    Inventor： Mitsukuni Konishi ,  Atsushi Nagate ,  Yoshichika Ota ,  Kenji Hoshino

    IPC: H04L27/26 ,  H04B7/185 ,  H04W84/06

    Abstract: In a mobile communication system using a mobile-type radio relay apparatus that forms a plurality of cells toward the ground or the sea while moving in an upper airspace, a deterioration in communication quality, which is caused by a Doppler shift of a reception signal due to a relative movement of a radio relay apparatus with respect to a terminal apparatus of each of a plurality of cells or a feeder station on the ground or on the sea, is suppressed. The communication system comprises a mobile-type radio relay apparatus that is disposed movably by flying in an upper airspace, forms a plurality of cells from an antenna at a predetermined altitude toward the ground or the sea, and performs a radio communication with a terminal apparatus located in each of the plurality of cells. The communication system comprises an estimation section for estimating a Doppler shift in at least one of a radio communication of a service link between the terminal apparatus located in the cell and the radio relay apparatus and a radio communication of a feeder link between the radio relay apparatus and a feeder station on the ground or on the sea, and a correction section for correcting a frequency of the at least one radio communication based on an estimation result of the Doppler shift.

    HAPS cooperative flight system
    4.
    发明授权
    HAPS cooperative flight system 有权

    公开(公告)号：US11308814B2

    公开(公告)日：2022-04-19

    申请号：US16966254

    申请日：2019-01-22

    Applicant: SoftBank Corp.

    Inventor： Takafumi Fujii ,  Yoshichika Ota ,  Kenji Hoshino

    IPC: G08G5/00 ,  H04B7/155

    Abstract: A system and a method for suppressing a deterioration of communication quality due to frequent occurrence of handovers at cell boundaries of a plurality of cells formed by a plurality of radio relay apparatuses that can move in an upper airspace, are provided. In the system, each of the plurality of radio relay apparatuses for performing a radio communication with a terminal apparatus comprises a radio relay station which is movably provided by flying in an upper airspace, forms a cell toward the ground or the sea, and performs a radio communication with a terminal apparatus located in the cell. Each of the plurality of radio relay apparatuses flies in cooperation with each other so as to maintain a positional relationship between the radio relay apparatuses by an autonomous control or external control.

    HAPS COOPERATIVE FLIGHT SYSTEM
    5.
    发明申请
    HAPS COOPERATIVE FLIGHT SYSTEM 审中-公开

    公开(公告)号：US20200380874A1

    公开(公告)日：2020-12-03

    申请号：US16966254

    申请日：2019-01-22

    Applicant: SoftBank Corp.

    Inventor： Takafumi Fujii ,  Yoshichika Ota ,  Kenji Hoshino

    IPC: G08G5/00 ,  H04B7/155

    Abstract: A system and a method for suppressing a deterioration of communication quality due to frequent occurrence of handovers at cell boundaries of a plurality of cells formed by a plurality of radio relay apparatuses that can move in an upper airspace, are provided. In the system, each of the plurality of radio relay apparatuses for performing a radio communication with a terminal apparatus comprises a radio relay station which is movably provided by flying in an upper airspace, forms a cell toward the ground or the sea, and performs a radio communication with a terminal apparatus located in the cell. Each of the plurality of radio relay apparatuses flies in cooperation with each other so as to maintain a positional relationship between the radio relay apparatuses by an autonomous control or external control.

    PHASED ARRAY ANTENNA, TRANSMISSION APPARATUS, RADIO-POWER TRANSMISSION SYSTEM AND RADIO COMMUNICATION SYSTEM
    8.
    发明申请
    PHASED ARRAY ANTENNA, TRANSMISSION APPARATUS, RADIO-POWER TRANSMISSION SYSTEM AND RADIO COMMUNICATION SYSTEM 有权

    公开(公告)号：US20230045955A1

    公开(公告)日：2023-02-16

    申请号：US17792156

    申请日：2020-12-08

    Applicant: SoftBank Corp.

    Inventor： Naoki Hasegawa ,  Yoshichika Ota

    IPC: H01Q3/42 ,  H02J50/23

    Abstract: Provided is a two-dimensional phased array antenna having a simple configuration capable of reducing the number of control systems and the number of control input ports for phase control of antenna elements. The phased array antenna comprises a plurality of antenna elements arranged in a first direction and a second direction intersecting the first direction, a plurality of frequency mixers for respectively supplying transmission signals with a predetermined transmission frequency (f) to the plurality of antenna elements, and means for generating a plurality of first mixing signals having a predetermined first phase difference (Δφ1) between the antenna elements adjacent to each other in the first direction and a plurality of second mixing signals having a predetermined second phase difference (Δφ2) between the antenna elements adjacent to each other in the second direction, based on three frequency-controllable input signals with respective frequencies different from each other, and supplying the plurality of first mixing signals and the plurality of second mixing signals to the plurality of frequency mixers.

    MASSIVE MIMO FOR HAPS BASED ON ANGLE INFORMATION ON USER APPARATUS
    9.
    发明公开
    MASSIVE MIMO FOR HAPS BASED ON ANGLE INFORMATION ON USER APPARATUS 审中-公开

    公开(公告)号：US20240056136A1

    公开(公告)日：2024-02-15

    申请号：US18264778

    申请日：2022-01-12

    Applicant: SoftBank Corp.

    Inventor： Koji Tashiro ,  Mitsukuni Konishi ,  Kenji Hoshino ,  Yoshichika Ota ,  Atsushi Nagate

    IPC: H04B7/0452 ,  H04B7/185 ,  H04W72/541

    CPC classification number: H04B7/0452 ,  H04B7/18539 ,  H04B7/18504 ,  H04W72/541

    Abstract: In an upper-airspace staying type communication relay apparatus that performs an MU-MIMO radio communication with plural terminal apparatuses located in a cell, it is intended to improve the communication quality of the entire cell and enhance the system capacity, while suppressing an increase in overhead in the terminal apparatus and the communication relay apparatus even if the number of terminal apparatuses located in the cell increases. The communication relay apparatus receives an uplink signal from each of plural terminal apparatuses via an array antenna, estimates angle information indicating a direction of the terminal apparatus for each of the plural terminal apparatuses, selects a terminal apparatus to be assigned to each of plural radio resources used for a downlink based on the estimation result of the angle information, calculates a downlink beamforming weight based on the estimation result of the angle information, and transmits a downlink signal to the terminal apparatus via the array antenna based on the beamforming weight corresponding to the terminal apparatus and the radio resources assigned to the terminal apparatus.

    Monitoring of radio relay apparatus using feeder link
    10.
    发明授权
    Monitoring of radio relay apparatus using feeder link 有权

    公开(公告)号：US11239902B2

    公开(公告)日：2022-02-01

    申请号：US16966227

    申请日：2019-01-22

    Applicant: SoftBank Corp.

    Inventor： Kazuki Matsuura ,  Yoshichika Ota

    IPC: H04B7/185 ,  H04W24/08 ,  H04W72/04 ,  H04W84/16

    Abstract: A radio relay apparatus, which can monitor a status of a radio relay apparatus for realizing a three-dimensional network, without providing a dedicated line, is provided. The radio relay apparatus can fly and move in an upper airspace, and comprises a first antenna for transmitting and receiving a radio signal of a feeder link to and from a gateway station on a communication network side provided on the ground or on the sea, a second antenna for transmitting and receiving a radio signal of a service link to and from a terminal apparatus, a relay processing section for relaying the radio signal of the feeder link and the radio signal of the service link, which is provided between the first antenna and the second antenna, an information acquisition section for acquiring monitoring information on the status of the radio relay apparatus, and an information communication section for transmitting the monitoring information to the gateway station via the feeder link.

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