Wake up signaling in 802.11 DFS channels

A method comprising:

• transitioning a device to a sleep state, wherein a primary connectivity radio of the device is disabled and a wake up radio of the device is enabled, the wake up radio to monitor for receipt of a wake up signal;
• detecting by the wake up radio of the device a composite radio signal transmitted by an access point in an available IEEE 802.11 Dynamic Frequency Selection (DFS) channel, the composite radio signal comprising both a wake up radio signal transmitted on a first frequency band of the DFS channel and a second signal transmitted on a second, different frequency band the second frequency band being substantially adjacent in frequency to, but not necessarily contiguous in frequency with, the first frequency band, and the second signal being a continuous signal over time;
• and
• responsive to receiving the composite radio signal, (i) enabling a primary connectivity radio of the device, and (ii) exchanging data between the primary connectivity radio and the access point.

An apparatus comprising:

• a primary connectivity radio configured to exchange data with an access point when the primary connectivity radio is enabled;
• and
• a wake up radio configured to monitor for receipt of wake up signal during a sleep state in which the primary connectivity radio of the apparatus is disabled and the wake up radio of the apparatus is enabled;
• wherein the apparatus is to:
• enable the primary connectivity radio responsive to the wake up radio detecting a composite radio signal transmitted by an access point in an available IEEE 802.11 Dynamic Frequency Selection (DFS) channel, the composite radio signal comprising both a wake up radio signal received on a first frequency band of the DFS channel and a second signal received on a second, different frequency band of the DS channel, the second frequency band being substantially adjacent in frequency t, but not necessarily contiguous in frequency with, the first frequency band, and the second signal being a continuous signal over time;
• and
• exchange data with the access point through the primary connectivity radio after the primary connectivity radio is enabled.