Patent ID: 8811322

Claim:
A method for informing an eNodeB of a transmit power status of a user equipment (UE) in a mobile communication system using component carrier aggregation, in which two or more component carriers (CCs) are aggregated, wherein the method comprises the following steps performed by the UE: generating a power status report that includes: (i) a power headroom report indicative of a difference between a nominal UE maximum transmit power and an estimated UE transmit power, per each configured and activated uplink CC, and (ii) a CC specific maximum transmission power, P CMAX,c , which is said nominal UE maximum transmit power and which is obtained based on subtraction of a CC specific amount of power reduction from a higher bound of UE maximum transmit power, P CMAX — H,c , for each configured and activated uplink CC, wherein the CC specific maximum transmission power, P CMAX,c , for each configured and activated CC is included in the power status report when the UE has a resource assignment for the configured and activated uplink CC, and transmitting the power status report to the eNodeB.