Terminal and first base station in wireless communication system and method thereof

The present disclosure relates to a communication technology for converging an IoT technology with a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety-related services, and the like) based on the 5G communication technology and the IoT-related technology. According to one embodiment of the present invention, a method for a terminal to transmit a data packet in a wireless communication system is provided. The method comprises the steps of: generating a data packet; determining whether to perform a copy transmission on the data packet; and generating at least two replicated packets by replicating the data packet if it is determined to perform the replicated transmission on the data packet; and transmitting the respective at ...