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：US10862614B2

公开(公告)日：2020-12-08

申请号：US16072249

申请日：2017-01-25

Applicant: SoftBank Corp.

Inventor： Daigo Ogata ,  Atsushi Nagate ,  Teruya Fujii

IPC: H04L1/00 ,  H04W16/32 ,  H04L1/16 ,  H04L5/00 ,  H04L1/18 ,  H04W28/04 ,  H04J11/00 ,  H04L27/26 ,  H04W72/04 ,  H04W72/08 ,  H04B7/0413

Abstract: A base station apparatus capable of preventing occurrence of a communication delay when performing an inter-cell interference control using an ABS is provided. The base station apparatus is capable of performing an inter-cell interference control by setting an ABS pattern with one cycle of a predetermined number of subframes, and when the ABS pattern is to be switched, changes an MCS (Modulation and Coding Scheme) index value to be determined by an adaptive modulation control, for a communication within a predetermined period of time on or before a switching time of the switching, with respect to a subframe in which a communication with a mobile station apparatus is allowed before switching the ABS pattern.