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) are provided. The communication method and system 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. A method performed by a terminal for handling listen before talk (LBT) failure in a wireless communication system is provided. The method comprises identifying consistent LBT failure for active uplink (UL) bandwidth part (BWP) in a serving cell, identifying at least one UL BWP for which consistent LBT failure has not been triggered on same carrier in the serving cell, wherein the at least one UL BWP is configured with physical random access channel (PRACH) occasion, and switching the active UL BWP to an UL BWP among the at least one UL BWP.