US 11,985,618 B2
Random access procedure for NR based satellite communication
Murali Narasimha, Lake Oswego, OR (US); Youn Hyoung Heo, San Jose, CA (US); and Yujian Zhang, Beijing (CN)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/420,127
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Jan. 8, 2020, PCT No. PCT/US2020/012748
§ 371(c)(1), (2) Date Jun. 30, 2021,
PCT Pub. No. WO2020/146506, PCT Pub. Date Jul. 16, 2020.
Claims priority of provisional application 62/789,958, filed on Jan. 8, 2019.
Prior Publication US 2022/0086786 A1, Mar. 17, 2022
Int. Cl. H04W 56/00 (2009.01); H04B 7/185 (2006.01); H04W 48/10 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 56/0045 (2013.01) [H04B 7/18513 (2013.01); H04W 48/10 (2013.01); H04W 56/0065 (2013.01); H04W 74/0833 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of wireless communication by a user equipment (UE), the method comprising:
obtaining a timing advance value for the wireless communication with a satellite base station, wherein the obtaining the timing advance value includes receiving the timing advance value in a broadcast system information message;
determining a transmission time for transmission of a random access channel (RACH) preamble based on the timing advance value;
transmitting the RACH preamble at the transmission time;
receiving a response to the transmitted RACH preamble; and
determining a correction to the timing advance value, wherein the correction is based on an altitude of the UE and wherein the determining the transmission time further includes applying the correction to the received timing advance value.