US 12,004,236 B2
Random access procedures for satellite communications
Xingqin Lin, San Jose, CA (US); Shiwei Gao, Nepean (CA); Helka-Liina Määttänen, Helsinki (FI); Siva Muruganathan, Stittsville (CA); Jonas Sedin, Sollentuna (SE); Hazhir Shokri Razaghi, Solna (SE); and Zhenhua Zou, Solna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Jun. 13, 2022, as Appl. No. 17/838,576.
Application 17/838,576 is a continuation of application No. 17/267,546, granted, now 11,363,643, previously published as PCT/IB2019/056739, filed on Aug. 7, 2019.
Claims priority of provisional application 62/717,359, filed on Aug. 10, 2018.
Prior Publication US 2023/0180306 A1, Jun. 8, 2023
Int. Cl. H04W 74/08 (2009.01); H04W 56/00 (2009.01); H04W 74/0833 (2024.01); H04W 76/11 (2018.01); H04W 84/06 (2009.01)
CPC H04W 74/0841 (2013.01) [H04W 56/0075 (2013.01); H04W 76/11 (2018.02); H04W 84/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for random access, the method comprising:
performing an open-loop timing advance estimation procedure to thereby determine an open-loop timing advance estimate for an uplink between the wireless device and a base station, wherein the open-loop timing advance estimate is based on a comparison of a first time when a downlink system sub-frame is received, and a second time that is an expected time based on system frame timing configuration received from the base station; and
transmitting a random access preamble using the open-loop timing advance estimate.