The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present invention relates to a method by a base station in a mobile communication system, the method comprising the steps of: checking a channel state in an unlicensed band; determining a parameter for checking whether a channel is occupied, according to the channel state; and transmitting the determined parameter to a terminal.