US 12,445,190 B2
Dynamic propagation spatial correlation by changing position of HAPS-equipped antenna in HAPS multi-feeder links
Takafumi Fujii, Tokyo (JP)
Assigned to SoftBank Corp., Tokyo (JP)
Appl. No. 18/016,464
Filed by SoftBank Corp., Tokyo (JP)
PCT Filed Jul. 7, 2021, PCT No. PCT/JP2021/025691
§ 371(c)(1), (2) Date Jun. 12, 2023,
PCT Pub. No. WO2022/019126, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 2020-125101 (JP), filed on Jul. 22, 2020.
Prior Publication US 2025/0192871 A1, Jun. 12, 2025
Int. Cl. H04B 7/185 (2006.01); H04B 17/336 (2015.01)
CPC H04B 7/18504 (2013.01) [H04B 7/18539 (2013.01); H04B 7/18563 (2013.01); H04B 17/336 (2015.01)] 14 Claims
OG exemplary drawing
 
1. An aerial-staying type communication relay apparatus having a relay communication station for relaying a radio communication of a terminal apparatus and plural antennas for feeder link, comprising:
a feeder-link communication section for transmitting and receiving relay signals different from each other at a same frequency in feeder links to and from plural gateway stations that are time-synchronized with each other;
an interference suppression section for suppressing interference between plural feeder links formed between the relay communication station and the plural gateway stations;
means for obtaining a correlation index value indicating a degree of propagation spatial correlation of the plural feeder links; and
means for changing a mutual positional relationship between the plural antennas for feeder link, based on a comparison result between the correlation index value and a predetermined threshold value.