US 12,408,005 B2
Differentiated time-difference of arrival for ultra-wideband (UWB)
Jerome Henry, Pittsboro, NC (US); Indermeet Singh Gandhi, San Jose, CA (US); and Robert E. Barton, Richmond (CA)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Sep. 6, 2022, as Appl. No. 17/929,791.
Claims priority of provisional application 63/347,327, filed on May 31, 2022.
Prior Publication US 2023/0388747 A1, Nov. 30, 2023
Int. Cl. H04W 4/029 (2018.01); H04W 4/02 (2018.01); H04W 4/021 (2018.01); H04W 8/00 (2009.01)
CPC H04W 4/029 (2018.02) [H04W 4/021 (2013.01); H04W 4/023 (2013.01); H04W 8/005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method comprising:
broadcasting a location tracking information for a venue, wherein broadcasting the location tracking information comprises:
notifying a user device that a location information is expected from the user device, and
providing an entity identity of an entity seeking the location information from the user device;
receiving a ranging message from the user device in response to the user device detecting broadcast comprising the location tracking information wherein receiving the ranging message from the user device comprises receiving the ranging message comprising a first random Media Access Control (MAC) address for a first time duration;
determining a position of the user device on the venue from the ranging message;
not receiving the ranging message for a second time duration after end of the first time duration; and
receiving the ranging message comprising a second random MAC address for a third time duration after an end of the second time duration.