Patent ID: 8509838

Claim:
A user equipment apparatus comprising: a transmission mode decision module determining whether the user equipment apparatus is currently operated to transmit a signal through one wireless communication chip or to transmit a plurality of signals simultaneously through a first wireless communication chip and a second wireless communication chip; an intermodulation distortion (IMD) effect decision module determining whether a set of frequencies of the plurality of signals transmitted from the first and second wireless communication chips causes intermodulation distortion; and a first transmission power control module performing a first power back-off as much as a preset value for a transmission power of a signal to be transmitted from the second wireless communication chip having a lower priority than the first wireless communication chip when the IMD effect decision module determines that the set of frequencies causes intermodulation distortion, wherein the first transmission power control module performs the first power back-off by subtracting the preset value from a transmission power value of the signal to be transmitted from the second wireless communication chip.