a method performed by a base station . the method according to an embodiment includes transmitting configuration information on an uplink channel allocated to a user equipment ; and receiving signals based on the configuration information . the signals are transmitted by using a maximum power reduction on maximum output power for transmission with non - contiguous resource allocation in a single component carrier . the mpr is determined according to : mpr = ceil , the ceil being a function of rounding up by 0 . 5 . the ma is determined according to : ma = when 0 & lt ; a ≦ 0 . 33 , ma = when 0 . 33 & lt ; a ≦ 0 . 77 , and ma = when 0 . 77 & lt ; a ≦ 1 . 0 , the a being a ratio of a number of simultaneously transmitted resource blocks in a channel bandwidth to a number of aggregated resource blocks in a fully allocated aggregated channel bandwidth .