US 11,929,820 B2
Frequency adjustment for non-terrestrial networks
Talha Khan, Santa Clara, CA (US); Olof Liberg, Enskede (SE); Stefan Eriksson Löwenmark, Färentuna (SE); and Xingqin Lin, San Jose, CA (US)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/636,009
Filed by TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
PCT Filed Aug. 12, 2020, PCT No. PCT/IB2020/057596
§ 371(c)(1), (2) Date Feb. 16, 2022,
PCT Pub. No. WO2021/033085, PCT Pub. Date Feb. 25, 2021.
Claims priority of provisional application 62/910,174, filed on Oct. 3, 2019.
Claims priority of provisional application 62/888,100, filed on Aug. 16, 2019.
Claims priority of application No. PCT/EP2019/080001 (WO), filed on Nov. 1, 2019.
Prior Publication US 2022/0286198 A1, Sep. 8, 2022
Int. Cl. H04B 7/185 (2006.01); H04W 56/00 (2009.01)
CPC H04B 7/1855 (2013.01) [H04W 56/0035 (2013.01); H04W 56/0045 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performed by a User Equipment (UE) for compensating for a Doppler shift in a wireless network, the method comprising:
obtaining, from a network node, a characterization of Doppler variations in a particular cell;
tuning a local frequency reference of the UE to a received downlink frequency for the particular cell; and
adjusting the local frequency reference over time according to a pre-calculated characterization of Doppler variations in the particular cell.