公开(公告)号：US11165621B2

公开(公告)日：2021-11-02

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.

公开(公告)号：US20210050910A1

公开(公告)日：2021-02-18

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

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.