US 12,425,862 B2
Attack detection in round-trip timing estimation
Igor Kolych, Lviv (UA); and Claudio Rey, Chandler, AZ (US)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Dec. 21, 2023, as Appl. No. 18/393,259.
Prior Publication US 2025/0211990 A1, Jun. 26, 2025
Int. Cl. H04W 56/00 (2009.01); H04W 12/121 (2021.01)
CPC H04W 12/121 (2021.01) [H04W 56/0035 (2013.01)] 20 Claims
OG exemplary drawing
 
9. A method comprising:
determining, by logic of a receiver adapted with Bluetooth® low energy (BLE) capability, frequency samples of bits of a predetermined pattern of a packet during a round-trip timing estimation of the packet, wherein the packet is received during a keyless access attempt of an enclosure having a transmitter and the receiver;
comparing, to a reference frequency sample, the frequency samples of bits of the predetermined pattern; and
in response to determining a difference between the reference frequency sample and the frequency samples of bits of the predetermined pattern, detecting an intrusion associated with the predetermined pattern.