In order to achieve the above-described object, a disclosure of this specification provides a method for performing, by a UE, a PDU session establishment request, in case information on a LADN area is changed. The method may include the steps of performing a first PDU session establishment request for a first LADN area, in case the first PDU session establishment request is transmitted from outside of the first LADN area, receiving a Reject message rejecting the first PDU session establishment request from a network system, in case the Reject message is received, transmitting a registration update request for updating a LADN area to the network system, receiving information on an updated second LADN area (LADN Service Area 2) as a response to the registration update request, and performing a second PDU session establishment request for the second LADN area.