Patent ID: 8471712

Claim:
A system for determining if a time period after a sensing node has sensed an event exceeds a threshold value, including establishing means for establishing a plurality of reference threshold values, wherein each reference threshold value is associated with a set of reference inter-event time intervals or metrics statistically derived therefrom, calculating means for calculating a set of preliminary time intervals or metrics statistically derived therefrom, based on events sensed by the sensing node, comparing means for comparing the set of preliminary inter-event time intervals or metrics statistically derived therefrom, with each set of reference inter-event time intervals or metrics statistically derived therefrom, identifying means for identifying the reference threshold value associated with the set of reference inter-event time intervals or metrics statistically derived therefrom, being the closest match to the set of preliminary inter-event time intervals or metrics statistically derived therefrom, and determining means for determining if, upon the sensing node sensing a further event, the time period after the sensing node has sensed the event exceeds the identified reference threshold value before a yet further event is sensed by the sensing node or an associated sensing node.