US 10,368,374 B2
PRACH-based proximity detection
Alan Barbieri, La Jolla, CA (US); Hao Xu, Beijing (CN); Vikas Jain, San Diego, CA (US); Durga Prasad Malladi, San Diego, CA (US); Awaiz Ahmad Khan, San Diego, CA (US); Samatha Kotla, San Diego, CA (US); and Balwinderpal Sachdev, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 22, 2017, as Appl. No. 15/713,250.
Application 15/713,250 is a division of application No. 14/165,351, filed on Jan. 27, 2014, granted, now 9,814,073.
Claims priority of provisional application 61/758,644, filed on Jan. 30, 2013.
Prior Publication US 2018/0014336 A1, Jan. 11, 2018
Int. Cl. H04W 4/00 (2018.01); H04W 74/08 (2009.01); H04W 52/28 (2009.01); G01S 5/00 (2006.01); H04W 64/00 (2009.01); H04W 52/02 (2009.01); H04L 1/00 (2006.01); G01S 5/02 (2010.01); H04W 28/16 (2009.01)
CPC H04W 74/0833 (2013.01) [G01S 5/00 (2013.01); H04L 1/00 (2013.01); H04W 52/0229 (2013.01); H04W 52/283 (2013.01); H04W 64/00 (2013.01); G01S 5/02 (2013.01); H04W 28/16 (2013.01); H04W 52/0206 (2013.01); Y02D 70/122 (2018.01); Y02D 70/1242 (2018.01); Y02D 70/1262 (2018.01); Y02D 70/1264 (2018.01); Y02D 70/142 (2018.01); Y02D 70/146 (2018.01); Y02D 70/20 (2018.01)] 26 Claims
OG exemplary drawing
 
1. A method of wireless communication, comprising:
entering a reduced power mode at a dynamic power node (DPN);
monitoring, by the DPN, for physical random access channel (PRACH) transmissions from one or more user equipments (UEs) proximate to the DPN;
detecting a plurality of candidate PRACH transmissions;
combining the plurality of candidate PRACH transmissions at the DPN to determine a detected PRACH transmission from a UE;
determining, by the DPN, a proximity of the UE based on the detected PRACH transmission;
modifying operation of the DPN in response to the proximity; and
monitoring, by the DPN, for a set of root sequences associated with at least one base station in a neighbor list at the DPN, wherein the set of root sequences are located in the PRACH transmissions from the one or more UEs, wherein the determining comprises:
determining the proximity of the UE based on a receive power of the PRACH transmission associated with a detected set of root sequences associated with one of the at least one base station in the neighbor list.