Described herein is a Core Network (CN) node 200 and a Radio Access Network (RAN) node 100 and methods therein for handling quality of service, QoS, targets for traffic flows between the RAN, node and a radio terminal 300 served by the RAN node, disclosing an obtaining a number of traffic classes into which the traffic flows can be classified, and QoS targets are defined for each obtained traffic class for at least two congestion levels, and wherein the traffic classes with the associated QoS targets and congestion levels are provided to the RAN node so as to provide congestion level dependent QoS targets for the traffic classes to the RAN node.