Patent ID: 8897706

Claim:
A method comprising: initiating a wideband scan mode in a Bluetooth slave device, the wideband scan mode configured to scan a Bluetooth frequency band while one or more components of the Bluetooth slave device are not awake, the one or more components including a medium access control (MAC) component; receiving a signal over multiple channels of the Bluetooth frequency band; detecting an energy pattern in the received signal based on a first or a second energy pattern threshold, the first energy pattern threshold configured for detection of a Bluetooth master device and the second energy pattern threshold configured for initiation of another scan mode; and responsive to detecting the energy pattern based on the first energy pattern threshold, waking the MAC component of the Bluetooth slave device and entering a normal receive mode to communicate with the Bluetooth master device; or responsive to detecting the energy pattern based on the second energy pattern threshold, initiating a midband scan mode in the Bluetooth slave device to determine whether the received signal is noise or a transmission from the Bluetooth master device; and responsive to a determination in the midband scan mode that the signal is from the Bluetooth master device, entering the normal receive mode.