In one embodiment of the present invention, a method by which an access and mobility management function (AMF) transmits/receives a signal for ensuring connectivity in a wireless communication system comprises the steps of: selecting, by the AMF, at least one next generation radio access network (NG-RAN) on a moving path of a user equipment (UE); and providing, by the AMF, a QoS reservation profile to the selected at least one NG-RAN, wherein the QoS reservation profile includes at least one piece of information about the UE, information about a flow/PDU session for which a resource reservation is required, required QoS-related information, a resource reservation start time and a resource reservation end time.