US 9,814,073 B2
PRACH-based proximity detection
Alan Barbieri, San Diego, CA (US); Hao Xu, San Diego, CA (US); 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 Jan. 27, 2014, as Appl. No. 14/165,351.
Claims priority of provisional application 61/758,644, filed on Jan. 30, 2013.
Prior Publication US 2014/0211677 A1, Jul. 31, 2014
Int. Cl. H04W 74/08 (2009.01); H04W 52/28 (2009.01); G01S 5/00 (2006.01); H04W 64/00 (2009.01); H04L 1/00 (2006.01); H04W 52/02 (2009.01); 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); Y02B 60/50 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A method of wireless communication, comprising:
transmitting, from a serving base station, a signal to a mobile device in communication with the serving base station, wherein the signal triggers the mobile device to transmit periodic transmissions on a physical random access channel (PRACH) during a time period, wherein the mobile device remains in communication with the serving base station and continues decoding data received from the serving base station during the time period;
transmitting, by the serving base station, downlink data to the mobile device for decoding during the time period; and
receiving, by the serving base station, uplink data from the mobile device during the time period,
wherein the signal includes one or more of:
a signature sequence set for the periodic transmissions on the PRACH;
a transmit power delta for open loop transmission power control;
a fixed transmit power for the periodic transmissions on the PRACH; and
a proximity detection flag.