Patent ID: 9323965
Filing Date: 2016-04-26
CPC Classification: G06K

Claim Text:
1. A method of choosing a communication mode of a radio-frequency identification (RFID) device which supports both a near-field communication mode and a far-field communication mode, comprising: interrupting generation of a self radio-frequency (RF) field signal; determining whether or not an external RF field signal for near-field communication is detected; choosing the near-field communication mode upon determining that the external RF field signal for near-field communication is detected; generating a self RF field signal for far-field communication upon determining that the external RF field signal for near-field communication is not detected; determining whether or not a response signal to the self RF field signal for far-field communication is received; choosing the far-field communication mode upon determining that the response signal is received; and choosing the near-field communication mode upon determining that the response signal is not received.