A method for limiting a spurious emission, the method performed by a user equipment (UE) and includes configuring a radio frequency (RF) unit to use bands 1 and 5 for a carrier aggregation; and determining at least one band to be protected, if another UE using at least one of bands 1, 3, 5, 7, 8, 38, 40, and 42 needs to be protected, controlling the RF unit to limit a maximum level of spurious emission to −50 dBm, and if another UE using a band 26 needs to be protected, controlling the RF unit of the UE to limit the maximum level of the spurious emission to −27 dBm.