A method for wireless communication at a user equipment, UE, comprising: identifying (1305, 1405, 1505), from a plurality of component carriers, CCs, used in carrier aggregation, CA, communication, a first CC having a first transmission time interval, TTI, duration as a reference CC and a second CC having a second TTI duration different from the first TTI duration; determining (1310, 1410, 1510), at a first TTI boundary of a first TTI of the reference CC, a first transmit power for the reference CC during the first TTI and a second transmit power for the second CC of the plurality of CCs during a second TTI that at least partially overlaps with the first TTI; determining (1315, 1415, 1515) an amount of transmit power to be reserved during the first TTI for adjusting the second transmit power at second TTI boundaries of the second CC, based at least in part on expected transmit power increases on the second CC during the first TTI of the reference CC; selecting (1420, 1520) a power amplifier, PA, gain value for a calibration point based at least in part on the amount of transmit power reserved during the first TTI, the first transmit power, and the second transmit power, wherein a same PA is used by the UE for transmissions on the reference CC and the second CC; and transmitting (1320, 1425, 1525), during the first TTI, at the first transmit power for the reference CC and at the second transmit power for the second CC, based at least in part on the amount of transmit power reserved, wherein the transmitting comprises digitally backing off from a transmit power corresponding to the PA gain value for the calibration point. identifying (1305, 1405, 1505), from a plurality of component carriers, CCs, used in carrier aggregation, CA, communication, a first CC having a first transmission time interval, TTI, duration as a reference CC and a second CC having a second TTI duration different from the first TTI duration; determining (1310, 1410, 1510), at a first TTI boundary of a first TTI of the reference CC, a first transmit power for the reference CC during the first TTI and a second transmit power for the second CC of the plurality of CCs during a second TTI that at least partially overlaps with the first TTI; determining (1315, 1415, 1515) an amount of transmit power to be reserved during the first TTI for adjusting the second transmit power at second TTI boundaries of the second CC, based at least in part on expected transmit power increases on the second CC during the first TTI of the reference CC; selecting (1420, 1520) a power amplifier, PA, gain value for a calibration point based at least in part on the amount of transmit power reserved during the first TTI, the first transmit power, and the second transmit power, wherein a same PA is used by the UE for transmissions on the reference CC and the second CC; and transmitting (1320, 1425, 1525), during the first TTI, at the first transmit power for the reference CC and at the second transmit power for the second CC, based at least in part on the amount of transmit power reserved, wherein the transmitting comprises digitally backing off from a transmit power corresponding to the PA gain value for the calibration point.