The present application at least describes a computer-implemented method including a step of setting, via a service layer residing on a server outside of an underlying 3GPP network, a trigger in the underlying 3GPP network, where the trigger defines an QoS parameter change in the underlying 3GPP network. The underlying 3GPP network is configured with functionality to send a notification to the service layer upon detecting the QoS parameter change. The computer-implemented method also includes a step of receiving, from the underlying 3GPP network, the notification the detected QoS parameter change has occurred. The computer-implemented method further includes a step of performing, at the service layer residing on the server a service layer operation in response to the received notification.