US 12,136,966 B2
Frequency offset in non-terrestrial networks
Stefan Eriksson Löwenmark, Färentuna (SE); Talha Khan, Santa Clara, CA (US); Xingqin Lin, Santa Clara, CA (US); Helka-Liina Määttänen, Helsinki (FI); and Sebastian Euler, Storvreta (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/290,616
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Nov. 1, 2019, PCT No. PCT/EP2019/080001
§ 371(c)(1), (2) Date Apr. 30, 2021,
PCT Pub. No. WO2020/089471, PCT Pub. Date May 7, 2020.
Claims priority of provisional application 62/755,072, filed on Nov. 2, 2018.
Prior Publication US 2022/0038139 A1, Feb. 3, 2022
Int. Cl. H04B 7/01 (2006.01); H04B 7/185 (2006.01); H04W 72/23 (2023.01)
CPC H04B 7/01 (2013.01) [H04B 7/18513 (2013.01); H04W 72/23 (2023.01)] 17 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for operating in a non-terrestrial network, NTN, the NTN including at least one network node and a communication satellite, the at least one network node being one of a terrestrial base station, a satellite base station and satellite gateway, the method comprising:
obtaining a frequency offset corresponding to at least one of a Doppler shift of transmission and reception frequencies between the wireless device and the network node;
applying the frequency offset to an uplink transmission to the network node,
the uplink transmission being part of an initial access procedure; and
receiving an indication from the network node corresponding to a variation in Doppler shift over time, the indication including at least one of:
a further frequency adjustment indication;
a time for which the frequency adjustment indication is valid; and
configuring the wireless device with a plurality of frequency offsets and a corresponding duration for which each frequency offset of the plurality of frequency offsets is valid.