The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Accordingly, the embodiments herein disclose a method for handling a timer operation in a wireless communication system (300). The method includes receiving, by a UE (100), a signaling message from a base station (200). The signaling message includes an information about acquired COT of the base station (200). Further, the method includes indicating, by the UE (100), about the acquired COT to a MAC layer from a physical layer. The physical layer indicates one of the base station (200) has acquired the COT for transmission and the base station (200) has missed a transmission opportunity due to a LBT failure.