The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment of the disclosure, a policy control function (PCF) entity in a wireless communication system comprises a transceiver and at least one processor. The at least one processor is configured to update a service-related policy based on a service transmission delay time (delay budget adjustment) per service flow, wherein the service transmission delay time per service flow is transmitted to a tethered device, schedule a quality-of-service (QoS) based on the service-related policy, and transmit, to a session management function (SMF) entity, a first message including the per-service flow service transmission delay time per service flow, the updated service-related policy, and a QoS requirement based on the scheduled QoS.