Patent ID: 8130103

Claim:
A method of reducing power consumption of a radio badge in a boundary detection localization system, the radio badge being carried by a tracked target and performing location sampling communication with an infrastructure component of the localization system at the start and end of sampling time intervals such that positions of the radio badge can be estimated, said method comprising: (a) determining a velocity of the radio; (b) estimating a critical time for the radio badge to reach a critical region through division in which a critical distance from an estimated position obtained at the end of a most recent sampling time interval to the critical region is the dividend, and the velocity of the radio badge is the divisor; and (c) controlling the radio badge to perform location sampling communication with the infrastructure component of the localization system at the end of the critical time; wherein if the estimated critical time in step (b) is greater than a preset upper bound, the critical time used in step (c) is set to be equal to the upper bound, and if the estimated critical time in step (b) is less than a preset lower bound, the critical time used in step (c) is set to be equal to the lower bound.