One embodiment relates to a computer implemented method for detecting if a person has fallen in an environment comprising multiple people. The method comprises controlling an active reflected wave detector to measure wave reflections from the multiple people to receive measured wave reflection data that is obtained by the active reflected wave detector. The method further comprises detecting if a person has fallen in the environment using at least a portion of the measured wave reflection data, wherein a fall status of a nearest person in the environment, being a person of the multiple people that is nearest to the active reflected wave detector, is deterministic of a detected fall.