Patent ID: 7953146

Claim:
A method for wireless data transmission between a base station and a transponder via inductive coupling, the transponder supporting a first data transmission protocol type or a second data transmission protocol type, the method comprising: transmitting by the base station a carrier signal; initiating a data transmission by the base station according to the second data transmission protocol by generating a field gap of the carrier signal; and encoding characters, which are transmitted by the base station to the transponder, by associated durations between temporally successive field gaps, a first character value being assigned a first duration, and at least one second character value being assigned a second duration, wherein each of said first duration and second duration are shorter than a maximum duration value, wherein, for a transponder supporting the first data transmission protocol type, the data transmission is ended when a duration between successive field gaps exceeds said maximum duration value, wherein, for a transponder supporting the second data transmission protocol type, after the initiation of the data transmission, a reference duration transmitted by the base station is used by the transponder to determine a calibration value in the transponder, the calibration value being then used for calibrating the subsequently received durations, wherein the reference duration is selected as being greater than said maximum duration value, and wherein the data transmission is ended when a duration determined after the reference duration exceeds said maximum duration value.