A method performed by a user equipment (UE)-to-network relay in a wireless communication system is provided. The method includes, in case that PC5 quality of service (QoS) flows setup is initiated by a remote UE, identifying whether QoS requirements associated with the remote UE and the UE-to-network relay are supported, in case that the QoS requirements are not supported, identifying one or more QoS parameters that satisfy the QoS requirements, and based on the one or more QoS parameters, updating a PC5 QoS flow.