A method comprising: receiving, by a user equipment, a configuration of a first uplink carrier and a second uplink carrier for a serving cell, wherein the first uplink carrier and the second uplink carrier are different, the first uplink carrier comprises a non-supplementary uplink carrier, and the second carrier comprises a supplementary uplink carrier; determining whether a configuration parameter corresponding to at least one of the first uplink carrier and the second uplink carrier for the serving cell is configured; determining whether a total user equipment transmit power for uplink transmissions in a transmission occasion exceeds a maximum user equipment output power, wherein the uplink transmissions comprise a first uplink transmission on the first uplink carrier and a second uplink transmission; in response to determining that the total user equipment transmit power for uplink transmissions in the transmission occasion exceeds the maximum user equipment output power, determining a first priority level for the first uplink transmission and a second priority level for the second uplink transmission; and in response to determining the first priority level for the first uplink transmission and the second priority level for the second uplink transmission being the same and the configuration parameter not being configured for the first uplink carrier and the second uplink carrier, prioritizing power allocation for the first uplink transmission on the first uplink carrier as a result of the first uplink carrier comprising the non-supplementary uplink carrier and the second uplink carrier comprising the supplementary uplink carrier; wherein the serving cell is a first serving cell, and the method further comprises operating the user equipment with carrier aggregation on the first serving cell and a second serving cell, wherein the second serving cell comprises a third uplink carrier and a fourth uplink carrier, the configuration parameter is not configured for the third uplink carrier and the fourth uplink carrier, the second uplink transmission is on the fourth uplink carrier, and the fourth uplink carrier comprises a further supplementary uplink carrier. receiving, by a user equipment, a configuration of a first uplink carrier and a second uplink carrier for a serving cell, wherein the first uplink carrier and the second uplink carrier are different, the first uplink carrier comprises a non-supplementary uplink carrier, and the second carrier comprises a supplementary uplink carrier; determining whether a configuration parameter corresponding to at least one of the first uplink carrier and the second uplink carrier for the serving cell is configured; determining whether a total user equipment transmit power for uplink transmissions in a transmission occasion exceeds a maximum user equipment output power, wherein the uplink transmissions comprise a first uplink transmission on the first uplink carrier and a second uplink transmission; in response to determining that the total user equipment transmit power for uplink transmissions in the transmission occasion exceeds the maximum user equipment output power, determining a first priority level for the first uplink transmission and a second priority level for the second uplink transmission; and in response to determining the first priority level for the first uplink transmission and the second priority level for the second uplink transmission being the same and the configuration parameter not being configured for the first uplink carrier and the second uplink carrier, prioritizing power allocation for the first uplink transmission on the first uplink carrier as a result of the first uplink carrier comprising the non-supplementary uplink carrier and the second uplink carrier comprising the supplementary uplink carrier; wherein the serving cell is a first serving cell, and the method further comprises operating the user equipment with carrier aggregation on the first serving cell and a second serving cell, wherein the second serving cell comprises a third uplink carrier and a fourth uplink carrier, the configuration parameter is not configured for the third uplink carrier and the fourth uplink carrier, the second uplink transmission is on the fourth uplink carrier, and the fourth uplink carrier comprises a further supplementary uplink carrier.