An energy efficient proximity awareness device

A proximity awareness device adapted to establish proximity awareness on neighbouring devices similar to said proximity awareness device, said proximity awareness device comprising:

• a first transceiver configured to implement a ranging protocol to determine a distance and/or angle between said proximity awareness device and at least one of said neighbouring devices;
• and
• a second transceiver configured to implement a discovery protocol to discover presence of said neighbouring devices, said second transceiver consuming less power than said first transceiver,
• wherein
• said first transceiver is controlled to operate according to a first duty cycle to switch between a full power state when ranging with a neighbouring device and a low power state wherein either its transmitter, its receiver or both are in a sleep state or are switched off when no ranging is performed;
• and
• said second transceiver is controlled to operate according to a second duty cycle to periodically switch between a full power state in order to perform said discovery protocol and a low power state wherein either its transmitter, its receiver or both are in a sleep state or are switched off.