DOPPLER SHIFT CORRECTION IN THREE-DIMENSIONAL NETWORK

Title:

DOPPLER SHIFT CORRECTION IN THREE-DIMENSIONAL NETWORK

Document Type and Number:

WIPO Patent Application WO/2019/135368

Kind Code:

A1

Abstract:

The present invention aims to suppress reduction in communications quality caused by doppler shift of reception signals caused by the relative movement of a wireless relay device relative to a terminal device, for each of a plurality of cells, or a ground or offshore feeder station, in a mobile communications system using a mobile wireless relay device which forms the plurality of cells towards the ground while moving through the air. This communications system comprises a wireless relay device that flies through the air, is provided so as to be mobile, forms the plurality of cells towards the ground or the ocean from an antenna having a prescribed altitude, and wirelessly communicates with a terminal device located in each of the plurality of cells. The communications system comprises: an estimation unit that estimates doppler shift in at least either service link wireless communication that is between a terminal device located in a cell and the wireless relay device or feeder link wireless communication that is between the wireless relay device and the ground or offshore feeder station; and a correction unit that corrects the frequency of the at least one wireless communication on the basis of the doppler shift estimation results.

Inventors:

KONISHI MITSUKUNI (JP)
NAGATE ATSUSHI (JP)
OHTA YOSHICHIKA (JP)
HOSHINO KENJI (JP)

Application Number:

PCT/JP2018/047241

Publication Date:

July 11, 2019

Filing Date:

December 21, 2018

Export Citation:

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Assignee:

SOFTBANK CORP (JP)

International Classes:

H04W84/06; H04B7/15; H04W72/04

Domestic Patent References:

WO2017076550A1	2017-05-11
WO2016135947A1	2016-09-01

Foreign References:

JP2001522191A	2001-11-13
JP2004500786A	2004-01-08
US6675013B1	2004-01-06

Other References: