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How Does a STA Synchronize the Channel When the Associated AP Switches to Another Channel?
- If both the STA and AP support channel change notification, the AP sends an action frame (802.11h) to the STA after the AP switches to a channel. The action frame is used to notify the STA of switching the channel immediately or after n Beacon intervals. The STA then switches the channel and retains online.
- If the AP supports channel change notification but the STA does not support channel change notification, the AP sends an action frame to the STA, notifying the STA of switching the channel immediately or after n Beacon intervals. The STA does not process the action frame, and goes offline after the AP switches to the channel.
- If the AP and STA do not support channel change notification, the AP switches to a channel and the STA goes offline.