A method for and apparatus for performing synchronization in a wireless communication system is provided. A wireless device receives information including a set of subframes in which a discovery signal or a synchronization signal is transmitted, and a muting pattern which is changed according to a downlink (DL)/uplink(UL) configuration of a corresponding cell; receives the discovery signal or the synchronization signal from a cell based on the information; and performs synchronization, wherein the information is indicated to cells via air interface from a source cell.