A link quality reporting method for a user equipment in a multicarrier communication system employing carrier aggregation, the method comprising: measuring, during communication with a base station through one or more activated component carriers that are selected from multiple available component carriers, link quality of each activated component carrier; and transmitting a message comprising the measured link quality of each activated component carrier to the base station , wherein the measuring of the link quality of each activated component carrier comprises performing a first measurement and a second measurement, the first measurement comprising measuring a first link quality of a first active region for control information, and the second measurement comprising measuring a second link quality of a second active region for data or a whole active region comprising the first active region for control information and the second active region for data, wherein the message comprises at least the first link quality related to the first measurement in case that a difference between the first and second link qualities of the first and second measurements is above a threshold, and the message comprises the second link quality related to the second measurement in case that the difference between the measured first and second link qualities of the first and second measurements is equal to or below the threshold, and wherein, in case that the message comprises the first link quality related to the first measurement, the message comprises first information identifying the each activated component carrier corresponding to the measured link quality, and second information indicating that the measured link quality is related to the first measurement. measuring, during communication with a base station through one or more activated component carriers that are selected from multiple available component carriers, link quality of each activated component carrier; and transmitting a message comprising the measured link quality of each activated component carrier to the base station , wherein the measuring of the link quality of each activated component carrier comprises performing a first measurement and a second measurement, the first measurement comprising measuring a first link quality of a first active region for control information, and the second measurement comprising measuring a second link quality of a second active region for data or a whole active region comprising the first active region for control information and the second active region for data, wherein the message comprises at least the first link quality related to the first measurement in case that a difference between the first and second link qualities of the first and second measurements is above a threshold, and the message comprises the second link quality related to the second measurement in case that the difference between the measured first and second link qualities of the first and second measurements is equal to or below the threshold, and wherein, in case that the message comprises the first link quality related to the first measurement, the message comprises first information identifying the each activated component carrier corresponding to the measured link quality, and second information indicating that the measured link quality is related to the first measurement. <EOS>