US 12,355,484 B2
Time offsets in ultra-wideband (UWB) ranging
Varun Amar Reddy, San Diego, CA (US); Alexandros Manolakos, Escondido, CA (US); Pooria Pakrooh, San Diego, CA (US); and Krishna Kiran Mukkavilli, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Nov. 21, 2022, as Appl. No. 18/057,753.
Prior Publication US 2024/0171215 A1, May 23, 2024
Int. Cl. H04B 1/7183 (2011.01); H04W 12/037 (2021.01)
CPC H04B 1/7183 (2013.01) [H04W 12/037 (2021.01)] 24 Claims
OG exemplary drawing
 
1. A method of enabling secure ultra-wideband (UWB) ranging between a first UWB device and a second UWB device, the method comprising:
determining, at the first UWB device, a respective time offset for each scrambled timestamp sequence (STS) in a series of STS used for ranging in a UWB ranging session between the first UWB device and the second UWB device, wherein the respective time offset for each STS in the series of STS:
varies from one STS to another in the series of STS,
is determined in accordance with time offset information shared between the first UWB device and the second UWB device using an in-band or out-of-band (OOB) link, and
comprises a change to a transmission time of the each STS in the series of STS from an expected transmission time; and
transmitting, with the first UWB device, the series of STS via UWB radio frequency (RF) signals during the UWB ranging session, wherein each STS in the series of STS is transmitted with the respective time offset.