802.11R is the Fast Transition across basic service sets which introduces a new concept where the initial handshake with a new AP is done even before the client roams to the target access point. It is particularly useful in environments where uninterrupted connectivity is crucial, such as in voice-over-IP or real-time stream applications with video or constant stream monitor. With a tuned 802.11r network, devices can roam between access points without the significant experience disruptions or drops in network connectivity.
Enable IEEE 802.11R