US 11,953,585 B2
Secure ranging with passive devices
Anantharaman Balasubramanian, San Diego, CA (US); Shuanshuan Wu, San Diego, CA (US); Kapil Gulati, Belle Mead, NJ (US); Junyi Li, Fairless Hills, PA (US); Sourjya Dutta, San Diego, CA (US); Preeti Kumari, San Diego, CA (US); Hong Cheng, Basking Ridge, NJ (US); Gene Wesley Marsh, San Diego, CA (US); and Shailesh Patil, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Oct. 27, 2021, as Appl. No. 17/452,513.
Prior Publication US 2023/0130477 A1, Apr. 27, 2023
Int. Cl. G01S 13/87 (2006.01); G01S 13/75 (2006.01); H04W 12/04 (2021.01); H04W 12/041 (2021.01)
CPC G01S 13/876 (2013.01) [G01S 13/751 (2013.01); H04W 12/041 (2021.01)] 27 Claims
OG exemplary drawing
 
1. A first user equipment (UE) for wireless communication, comprising:
memory; and
one or more processors coupled to the memory, the memory comprising instructions executable by the one or more processors to cause the first UE to:
transmit, to a second UE via reflection by one or more passive devices, a first reference signal (RS) that is based at least in part on a first key that is shared with the second UE and that corresponds to a configuration of the one or more passive devices wherein the configuration includes a timing of when each of the one or more passive devices is active or inactive;
receive, from the second UE via reflection by the one or more passive devices and in association with the transmitting of the first RS, a second RS that is based at least in part on the first key;
generate a second key based at least in part on a measurement of the second RS on a channel that is established between the first UE and the second UE according to the configuration of the one or more passive devices; and
transmit a positioning reference signal (PRS) that is based at least in part on the second key and that is associated with a measurement of a range between the first UE and the second UE.