US 10,368,301 B2
Multi-beam and single-beam discovery reference signals for shared spectrum
Arumugam Chendamarai Kannan, San Diego, CA (US); Chirag Patel, San Diego, CA (US); and Tamer Kadous, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Aug. 11, 2017, as Appl. No. 15/675,217.
Claims priority of provisional application 62/461,671, filed on Feb. 21, 2017.
Prior Publication US 2018/0242232 A1, Aug. 23, 2018
Int. Cl. H04W 48/16 (2009.01); H04W 16/28 (2009.01); H04W 72/04 (2009.01); H04B 17/309 (2015.01); H04W 16/14 (2009.01); H04L 5/00 (2006.01); H04B 7/06 (2006.01); H04W 88/08 (2009.01)
CPC H04W 48/16 (2013.01) [H04B 7/0695 (2013.01); H04L 5/005 (2013.01); H04L 5/0048 (2013.01); H04W 16/14 (2013.01); H04W 16/28 (2013.01); H04W 72/046 (2013.01); H04W 72/0453 (2013.01); H04B 17/309 (2015.01); H04L 5/0037 (2013.01); H04L 5/0091 (2013.01); H04W 88/08 (2013.01)] 22 Claims
OG exemplary drawing
 
22. An apparatus for wireless communications, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory, wherein the instructions are executable by the processor to:
determine multiple transmission beams for transmission of a discovery reference signal (DRS) over a shared radio frequency spectrum band;
perform a first listen before talk (LBT) procedure for the DRS based at least in part on the multiple transmission beams;
transmit, based at least in part on the first LBT procedure, the DRS over the shared radio frequency spectrum band using a set of the multiple transmission beams;
perform an opportunistic beam-specific second LBT procedure for a first beam of the multiple transmission beams; and
transmit an opportunistic DRS on the first beam based at least in part on a success of the opportunistic beam-specific second LBT procedure for the first beam.