Provided is a method performed by a UE in a wireless communication system including receiving at least one synchronization signal from a base station (BS), receiving system information from the BS, receiving a radio resource control (RRC) message from the BS, wherein the RRC message includes information on a number of data allocation offset index group candidates related to a data allocation offset, receiving downlink control Information (DCI) from the BS, wherein the DCI includes information on a data allocation offset index related to the data allocation offset.