One embodiment relates to a method for a Session Management Function (SMF) transmitting/receiving a signal in a wireless communication system, the method comprising the steps in which: a SMF receives information associated with a non-accepted GBR QoS Flow; and the SMF transmits, to a target Next Generation-Radio Access Network (NG-RAN), request information associated with the applying of QoS Notification Control (QNC) to the non-accepted GBR QoS Flow.