A method for receiving a channel state information-reference signal, CSI-RS, by a user equipment, UE, (10, 20) in a wireless communication system, the method comprising: receiving information related to a reference position commonly used for mapping of CSI-RSs of a plurality of cells which have different center frequencies and different bandwidths, wherein the information related to the reference position is information about an offset; receiving CSI-RSs of the plurality of cells and measuring reception power of the CSI-RSs within a measurement bandwidth wherein sequence elements of each of the CSI-RSs are mapped to physical resources based on the reference position and a received initial value of a sequence generator for each of the plurality of cells, and the received initial value is different for each of the plurality of cells, wherein the offset represents a distance between the reference position and the measurement bandwidth, wherein the reference position is configured as a position of a resource block which is located outside a system band operated in each of the plurality of cells, and wherein, when the measurement bandwidth is less than an active bandwidth part of the UE, the frequency position of the measurement band within the active BWP is received and when the measurement bandwidth is identical to the active BWP, signalling of the frequency position of the measurement band is omitted and the measuring is performed on the assumption that the active BWP is configured as the measurement bandwidth, and wherein the sequence elements of each of the CSI-RSs are generated under assumption that each of first sequence element of each of the CSI-RSs of the plurality of cells is mapped to a subcarrier for the reference position, and wherein, among the sequence elements of each of the CSI-RSs, the one or more sequence elements of each of the CSI-RSs corresponding subcarriers of the measurement band are selected and mapped to the subcarriers of the measurement band. receiving information related to a reference position commonly used for mapping of CSI-RSs of a plurality of cells which have different center frequencies and different bandwidths, wherein the information related to the reference position is information about an offset; receiving CSI-RSs of the plurality of cells and measuring reception power of the CSI-RSs within a measurement bandwidth wherein sequence elements of each of the CSI-RSs are mapped to physical resources based on the reference position and a received initial value of a sequence generator for each of the plurality of cells, and the received initial value is different for each of the plurality of cells, wherein the offset represents a distance between the reference position and the measurement bandwidth, wherein the reference position is configured as a position of a resource block which is located outside a system band operated in each of the plurality of cells, and wherein, when the measurement bandwidth is less than an active bandwidth part of the UE, the frequency position of the measurement band within the active BWP is received and when the measurement bandwidth is identical to the active BWP, signalling of the frequency position of the measurement band is omitted and the measuring is performed on the assumption that the active BWP is configured as the measurement bandwidth, and wherein the sequence elements of each of the CSI-RSs are generated under assumption that each of first sequence element of each of the CSI-RSs of the plurality of cells is mapped to a subcarrier for the reference position, and wherein, among the sequence elements of each of the CSI-RSs, the one or more sequence elements of each of the CSI-RSs corresponding subcarriers of the measurement band are selected and mapped to the subcarriers of the measurement band.