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. The method for transmitting/receiving signals in a mobile communication system according to an embodiment of the present invention includes: receiving control information; obtaining information related to the orthogonal cover code (OCC) length, based on the received control information; and receiving a reference signal, based on the information related to the OCC length. In a mobile communication system according to embodiments of the present invention, the base station transmits information related to a reference signal to a terminal, and the terminal receives the reference signal based on the received information, thereby improving the performance of channel estimation.