US 9,813,994 B2
Managing transmit power for better frequency re-use in TV white space
Santosh Paul Abraham, San Diego, CA (US); Sameer Vermani, San Diego, CA (US); Hemanth Sampath, San Diego, CA (US); Stephen J. Shellhammer, Ramona, CA (US); and Rahul Tandra, San Diego, CA (US)
Assigned to QUALCOMM, Incorporated, San Diego, CA (US)
Filed by Santosh Paul Abraham, San Diego, CA (US); Sameer Vermani, San Diego, CA (US); Hemanth Sampath, San Diego, CA (US); Stephen J. Shellhammer, Ramona, CA (US); and Rahul Tandra, San Diego, CA (US)
Filed on Feb. 15, 2012, as Appl. No. 13/397,450.
Claims priority of provisional application 61/443,587, filed on Feb. 16, 2011.
Prior Publication US 2013/0148517 A1, Jun. 13, 2013
Int. Cl. H04W 24/00 (2009.01); H04W 52/04 (2009.01); H04B 7/12 (2006.01); H04L 1/00 (2006.01); H04W 52/32 (2009.01); H04W 74/08 (2009.01); H04L 1/06 (2006.01); H04W 52/36 (2009.01)
CPC H04W 52/04 (2013.01) [H04B 7/12 (2013.01); H04L 1/0002 (2013.01); H04L 1/0027 (2013.01); H04W 52/325 (2013.01); H04W 74/0816 (2013.01); H04L 1/0009 (2013.01); H04L 1/06 (2013.01); H04W 52/367 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A first apparatus for wireless communications, comprising:
a transmitter configured to transmit a sequence of request-to-send (RTS) messages at different transmit power levels to a second apparatus via one or more wireless channels; and
a processing system configured to determine if a clear-to-send (CTS) message was received in response to at least one of the RTS messages corresponding to a particular one of the transmit power levels,
wherein the transmitter is configured to transmit the sequence of RTS messages using a first wireless channel and, if the CTS message is not received in response to at least one of the RTS messages transmitted using the first wireless channel, to transmit the sequence of RTS messages using a second wireless channel.