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. Method and system for minimizing channel preservation time in a cellular communication network. The system, after channel sensing and if the channel is free, dynamically determines a Preservation Signal (PS) value, and then adjusts the channel preservation time, based on the determined PS value. The system can minimize the channel preservation time, by restarting data transmission upon detecting a symbol boundary, while the data transmission is in progress.