US 12,120,746 B2
Channel sensing for physical random access channel (PRACH) signals in new radio (NR) systems operating in the unlicensed spectrum
Carlos H. Aldana, Cupertino, CA (US); Salvatore Talarico, Cupertino, CA (US); Yongjun Kwak, Cupertino, CA (US); and Lopamudra Kundu, Cupertino, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/441,122
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Jun. 19, 2020, PCT No. PCT/US2020/038728
§ 371(c)(1), (2) Date Sep. 20, 2021,
PCT Pub. No. WO2020/257645, PCT Pub. Date Dec. 24, 2020.
Claims priority of provisional application 62/863,691, filed on Jun. 19, 2019.
Prior Publication US 2022/0167423 A1, May 26, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 72/23 (2023.01); H04W 74/00 (2009.01)
CPC H04W 74/0833 (2013.01) [H04W 72/23 (2023.01); H04W 74/004 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An apparatus employed in a user equipment (UE), comprising processing circuitry configured to:
generate and cause transmission of a first message comprising a preamble of a random access channel (RACH);
receive, from a base station, a second message indicating a reception of the preamble and comprising a time-adjustment command and a scheduling grant via a physical downlink channel;
generate and cause transmission of a third message based on a resource indicated by the scheduling grant of the second message;
receive, from the base station, a fourth message comprising contention resolution information; and
generate a hybrid automatic repeat request (HARQ) feedback based on the fourth message,
wherein the third message includes a listen-before-talk (LBT) indication that indicates which LBT type the base station is to perform, and wherein the LBT indication comprises one bit of an uplink control information (UCI).