US 11,792,845 B2
Channel access with conditional variable energy detection thresholds in shared frequency bands
Aleksandar Damnjanovic, Del Mar, CA (US); Yisheng Xue, San Diego, CA (US); Maarten Menzo Wentink, Nijmegen (NL); Jing Sun, San Diego, CA (US); and Xiaoxia Zhang, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM INCORPORATED, San Diego, CA (US)
Filed on Jul. 30, 2021, as Appl. No. 17/389,554.
Claims priority of provisional application 63/067,861, filed on Aug. 19, 2020.
Prior Publication US 2022/0061088 A1, Feb. 24, 2022
Int. Cl. H04W 74/08 (2009.01)
CPC H04W 74/08 (2013.01) 30 Claims
OG exemplary drawing
 
1. A method of wireless communication performed by a first wireless communication device, the method comprising:
performing, during a deferral period of a listen-before talk (LBT) procedure, a first clear channel assessment (CCA) in a shared radio frequency band based on a first energy detection threshold, wherein performing the first CCA comprises obtaining at least one signal energy measurement;
performing, during a countdown period of the LBT procedure subsequent to the deferral period, a second CCA in the shared radio frequency band based on a second energy detection threshold, wherein the second energy detection threshold is higher than the first energy detection threshold, and wherein the performing the second CCA based on the second energy detection threshold is based on the at least one signal energy measurement satisfying a measurement threshold that is lower than the first energy detection threshold; and
transmitting, to a second wireless communication device in the shared radio frequency band based on the second CCA, a communication signal.