US 12,279,306 B2
Random access channel access and validity procedures
Pravjyot Singh Deogun, Bengaluru (IN); Xiaoxia Zhang, San Diego, CA (US); Ozcan Ozturk, San Diego, CA (US); Jing Sun, San Diego, CA (US); Kapil Bhattad, Bangalore (IN); and Ananta Narayanan Thyagarajan, Bangalore (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Nov. 9, 2020, as Appl. No. 17/093,374.
Application 17/093,374 is a continuation of application No. 16/790,623, filed on Feb. 13, 2020, granted, now 10,869,336.
Claims priority of application No. 201941006033 (IN), filed on Feb. 15, 2019.
Prior Publication US 2021/0058976 A1, Feb. 25, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 74/08 (2009.01); H04L 5/00 (2006.01); H04W 8/00 (2009.01); H04W 56/00 (2009.01); H04W 74/0808 (2024.01); H04W 74/0833 (2024.01); H04W 80/02 (2009.01)
CPC H04W 74/0808 (2013.01) [H04L 5/0048 (2013.01); H04W 8/005 (2013.01); H04W 56/001 (2013.01); H04W 74/0833 (2013.01); H04W 80/02 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method of wireless communication performed by a user equipment (UE), the method comprising:
receiving a random access configuration message identifying a plurality of configured random access occasions configured over a shared communication spectrum and identifying a number of random access occasions;
measuring a signal strength of at least one synchronization signal block (SSB) detected on the shared communication spectrum, wherein the at least one SSB is associated with a random access occasion of the plurality of configured random access occasions;
selecting the random access occasion associated with the at least one SSB in accordance with the signal strength of the at least one SSB being greater than a threshold signal strength, wherein the plurality of configured random access occasions are less than or equal to the number of random access occasions;
performing one or more listen before talk (LBT) procedures prior to at least the random access occasion;
initiating an LBT counter for a first LBT procedure of the one or more LBT procedures for a first random access transmission attempt on the random access occasion;
updating a value of the LBT counter in response to detection of a failure of an LBT procedure associated with the random access occasion, wherein the value of the LBT counter is maintained until a counter reset event;
determining a consistent LBT failure based on the value of the LBT counter; and
communicating the consistent LBT failure to a network node.