Embodiments of a method in a radio access node and a corresponding radio access node are disclosed. The method comprises: sending, to a mobility function entity, first information indicative of a tracking area(s) and a network slice(s) supported by the radio access node; and receiving, from the mobility function entity, second information indicative of a network slice(s) that are: (a) supported by the radio access node and the mobility function entity and (b) permitted by one or more network policies, for each of at least one of the tracking area(s) supported by the radio access node; or (a) supported by the mobility function entity and (b) permitted by one or more network policies, for each of at least one of the tracking area(s) supported by the radio access node. Embodiments of a method in a mobility function entity and a corresponding mobility function entity are also disclosed.