a method for assigning a tracking area is disclosed . a mobility state of a wireless transmit / receive unit is determined and the ta is assigned based on the determined mobility state . also disclosed is a method for accessing a closed subscriber group ta . a csg ta identifier is received at a wtru and is stored . a csg ta broadcast is received and the broadcast csg ta is accessed if an identifier of the broadcast csg ta matches the stored csg ta identifier . also disclosed is a method for changing a mobility state of a wtru . a current mobility state of the wtru is determined and a predetermined metric of the wtru is examined . the predetermined metric is evaluated to determine if the metric has crossed a threshold and the mobility state is changed based on the evaluated metric .