A method by a Policy Control Function, PCF of enabling a Session Management Function, SMF, in a telecommunication network to enforce a Policy and Charging Control, PCC, rule, in relation to a Protocol Data Unit, PDU, session between a User Device and the telecommunication network by providing, by said PCF, in said telecommunication network, Quality-of-Service, QoS, parameters to said SMF for use in said PCC rule, said method comprises the steps of: - receiving, by said PCF, service information comprising service QoS requirements and alternative QoS requirements; - mapping, by said PCF, said received service information into QoS parameters and related charging parameters, wherein said QoS and related charging parameters at least comprise: - a QoS profile and a charging profile bound to said QoS profile, and - an alternative QoS profile and an alternative charging profile bound to said alternative QoS profile, wherein said alternative QoS profile and said alternative charging profile is to be used in case of QoS degradation; - providing, by said PCF, to said SMF, said mapped QoS parameters and related charging parameters for enforcing said PCC rule in relation to said PDU session between said User Device and said telecommunication network; characterized in that the method comprises the steps performed by the PCF, of: - receiving, by said PCF, from said SMF, a notification that QoS targets are not guaranteed and comprises said alternative QoS profile that is guaranteed and said alternative charging profile that is being applied; - notifying, by said PCF to an Application Function, AF, that the service QoS targets cannot be guaranteed and indicates the alternative service requirements being applied. - receiving, by said PCF, service information comprising service QoS requirements and alternative QoS requirements; - mapping, by said PCF, said received service information into QoS parameters and related charging parameters, wherein said QoS and related charging parameters at least comprise: - a QoS profile and a charging profile bound to said QoS profile, and - an alternative QoS profile and an alternative charging profile bound to said alternative QoS profile, wherein said alternative QoS profile and said alternative charging profile is to be used in case of QoS degradation; - a QoS profile and a charging profile bound to said QoS profile, and - an alternative QoS profile and an alternative charging profile bound to said alternative QoS profile, wherein said alternative QoS profile and said alternative charging profile is to be used in case of QoS degradation; - providing, by said PCF, to said SMF, said mapped QoS parameters and related charging parameters for enforcing said PCC rule in relation to said PDU session between said User Device and said telecommunication network; - receiving, by said PCF, from said SMF, a notification that QoS targets are not guaranteed and comprises said alternative QoS profile that is guaranteed and said alternative charging profile that is being applied; - notifying, by said PCF to an Application Function, AF, that the service QoS targets cannot be guaranteed and indicates the alternative service requirements being applied.