i) No-transition
ii) BSS-transition
iii) ESS-transition
i) No-transition : A station with no-transition mobility i either stationary(not moving) or moving only inside a BSS.
ii) BSS-transition : It stands for Basic service transition. A station with BSS-transition mobility can move from one BSS to another, but the movement is confined inside one ESS.
iii) ESS-transition : It stands for extended set transition.A station with ESS-transition mobility can move from one ESS to another.