US 11,855,713 B2
Method for implementing an NFC transaction
Nicolas Cordier, Aix-en-Provence (FR)
Assigned to STMICROELECTRONICS (ROUSSET) SAS, Rousset (FR)
Filed by STMICROELECTRONICS (ROUSSET) SAS, Rousset (FR)
Filed on Mar. 22, 2022, as Appl. No. 17/701,416.
Claims priority of application No. 2103038 (FR), filed on Mar. 25, 2021.
Prior Publication US 2022/0311476 A1, Sep. 29, 2022
Int. Cl. H04B 5/00 (2006.01); H04B 17/318 (2015.01)
CPC H04B 5/0031 (2013.01) [H04B 17/318 (2015.01)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a first Near-Field Communication (NFC) device, a first signal from a second NFC device and exiting, by the first NFC device, a polling mode in response to a level of the first signal exceeding a first threshold;
receiving, by the first NFC, a second signal from the second NFC device and switching, by the first NFC device, to operating in a card mode in response to the second signal exceeding a second threshold that is greater than the first threshold;
determining, by the first NFC device, a type of modulation technology of the second NFC device from a plurality of types of modulation technology and setting a third threshold depending on the type of modulation technology;
receiving a third signal by the first NFC device configured in card mode; and
initiating a transaction between the first NFC device and the second NFC device configured in reader mode based on a level of the third signal reaching the third threshold.