Patent ID: 8254951

Claim:
A device for selectively providing a signal receivable by an associated mobile terminal in proximity to the device when the device has not been moved from a predetermined location, comprising: means for recording a pattern of selected ambient radio signals to derive a value range, the ambient radio signals being recorded during a first time period from selected ambient radio signals belonging at least to a mobile telecommunications network to which the associated mobile terminal subscribes, the value range indicating a range of signal strengths of the selected ambient radio signals over the first time period; means for measuring the selected ambient radio signals to produce a measurement value during a second time period, the measurement value indicating a specific signal strength of the selected ambient radio signals at the second time period; means for comparing the measurement value with the value range to determine whether the measurement value is included in the value range, wherein having the measurement value be found within the value range is indicative that the device has not been moved from the predetermined location and having the measurement value not be found with the value range is indicative that the device has been moved from the predetermined location; and means for selectively enabling transmission of a proximity indication signal to the mobile terminal in dependence upon the determination of the comparing means.