US 12,295,043 B2
Random access procedure fallback
Xiaoxia Zhang, San Diego, CA (US); Jing Sun, San Diego, CA (US); Sony Akkarakaran, Poway, CA (US); Muhammad Nazmul Islam, Littleton, MA (US); and Tao Luo, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 7, 2023, as Appl. No. 18/243,234.
Application 18/243,234 is a continuation of application No. 17/366,595, filed on Jul. 2, 2021, granted, now 11,792,858.
Application 17/366,595 is a continuation of application No. 16/746,704, filed on Jan. 17, 2020, granted, now 11,064,537, issued on Jul. 13, 2021.
Claims priority of provisional application 62/800,329, filed on Feb. 1, 2019.
Prior Publication US 2024/0090036 A1, Mar. 14, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/0833 (2024.01); H04W 36/00 (2009.01); H04W 76/10 (2018.01)
CPC H04W 74/0833 (2013.01) [H04W 36/0079 (2018.08); H04W 76/10 (2018.02)] 30 Claims
OG exemplary drawing
 
1. A user equipment (UE), comprising:
one or more memories that store processor-executable code; and
one or more processors coupled with the one or more memories and configured to, when executing the code, cause the UE to:
transmit, as part of a two-step random access procedure, a portion of a first random access message including a random access preamble;
perform an unsuccessful listen-before-talk (LBT) procedure within a gap between the portion of the first random access message including the random access preamble and a physical uplink shared channel (PUSCH) occasion associated with the first random access message; and
monitor, within a response window that is associated with the two-step random access procedure and that follows the PUSCH occasion associated with the first random access message, a physical downlink control channel (PDCCH) to receive a second random access message in response to the first random access message, wherein the second random access message indicates one of: a success of the two-step random access procedure or a fallback to a four-step random access procedure.