Patent ID: 8190189

Claim:
A communication system, comprising: a first and a second communication device, each comprising transmit and receive units for establishing a wireless link between the devices, wherein at least the first communication device is a portable listening device and comprises a control unit for dynamically adjusting the transmit power of its transmit unit based on a measure of the quality of the link, the system is configured to use the dynamic transmit power adjusting to implement a partial power-down mode of the system, when the two communication devices are expected not to be in a normal use, the partial power-down mode at least comprises a power-down of the components related to the wireless link, the system is configured to be in an operational state or Normal mode when the first and second devices are within a Typical range of distances from each other, the Typical zone, and the system is further configured to detect whether a transmitting device is located in a VeryClose zone, where the two devices are closer to each other than in the Typical zone and in which case the system is in a VeryClose mode and to detect whether a transmitting device is located in a VeryFar zone, where the two devices are farther away from each other than in the Typical zone and in which case the system is in a VeryFar mode.