Bluetooth wideband scan mode

A Bluetooth device comprising circuitry configured to:

• initiate a wideband scan mode, the wideband scan mode configured to scan a Bluetooth frequency band while one or more components of the Bluetooth device are not awake, the one or more components including a medium access control (MAC) component;
• receive a signal over multiple channels of the Bluetooth frequency band;
• detect 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, wake the MAC component of the Bluetooth device and enter 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, initiate a midband scan mode 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, enter the normal receive mode.

One or more computer-readable hardware devices comprising processor-executable instructions that, responsive to execution by a processor, cause a Bluetooth device to:

• initiate a wideband scan mode of the Bluetooth device, the wideband scan mode configured to scan a Bluetooth frequency band while a medium access control (MAC) component of the Bluetooth device is not awake;
• receive a signal over multiple channels of the Bluetooth frequency band;
• detect 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, wake the MAC component of the Bluetooth device and enter 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, initiate a narrowband scan mode of the Bluetooth device to determine whether the received signal is noise or a transmission from the Bluetooth master device;
• and responsive to a determination in the narrowband scan mode that the signal is from the Bluetooth master device, enter the normal receive mode to communicate with the Bluetooth master device.