Using radio irregularity for increasing residential energy awareness

Radio irregularity phenomenon is often considered as a shortcoming of wireless networks. In this paper we present the method of using radio irregularity as an efficient human presence detection sensor which increases user awareness in smart homes. The idea is based on monitoring the received signal strength indicator (RSSI) between stationary wireless (2.4 GHz - Zigbee) power outlets. When a human enters into the existing radio communication field, the signal can be absorbed, scattered or reflected by the body what results in strong variations of RSSI. Based on the detected changes compared to the initial values, the system detects human presence and responds with the automatic control of any appliance connected to outlets. Compared to conventional sensors, the proposed solution preserves the sensorial intelligence, simplicity and low installation costs without need for additional devices integration.