US 11,706,000 B2
Techniques for managing sounding reference signal (SRS) transmissions in shared radio frequency spectrum
Jing Sun, San Diego, CA (US); Xiaoxia Zhang, San Diego, CA (US); Kapil Bhattad, Bangalore (IN); and Tanumay Datta, Bangalore (IN)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Mar. 16, 2020, as Appl. No. 16/819,543.
Claims priority of application No. 201921012552 (IN), filed on Mar. 29, 2019.
Prior Publication US 2020/0313816 A1, Oct. 1, 2020
Int. Cl. H04L 5/00 (2006.01); H04W 74/08 (2009.01); H04L 27/26 (2006.01); H04W 72/0446 (2023.01); H04W 16/14 (2009.01)
CPC H04L 5/0048 (2013.01) [H04L 5/001 (2013.01); H04L 27/2607 (2013.01); H04W 16/14 (2013.01); H04W 72/0446 (2013.01); H04W 74/0808 (2013.01)] 26 Claims
OG exemplary drawing
 
20. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify a sounding reference signal configuration for transmission of one or more sounding reference signals that indicates periodic intervals for transmission of the one or more sounding reference signals, and at least two time offset values associated with each periodic interval, the at least two time offset values including a first offset value from a starting time of each periodic interval that indicates a first transmission time that is available for the one or more sounding reference signal transmissions, and a second offset value from the starting time of each periodic interval or from the first transmission time that indicates a second transmission time within each periodic interval, wherein the second transmission time, within a first periodic interval, is available for transmission of the one or more sounding reference signals if a first listen-before-talk procedure for the first transmission time of the first periodic interval is unsuccessful, and wherein one or more of the first offset value or the second offset value is determined based at least in part on a random selection from a set of available offset values;
determine, based at least in part on the first listen-before-talk procedure for the first transmission time, that a wireless channel in a shared radio frequency spectrum band is unavailable for transmission of a first sounding reference signal at the first transmission time; and
perform at least a second listen-before-talk procedure for at least the second transmission time of the first periodic interval to determine whether the wireless channel in the shared radio frequency spectrum band is available for transmission of the first sounding reference signal.