First base station and user equipment in heterogeneous network wireless communication system and method thereof

A method performed by a first base station in a heterogeneous network wireless communication system including the first base station and a second base station, the first base station, user equipment for performing measurement reporting, and a method of reporting measurement by the user equipment are provided. The method performed by the first base station includes: transmitting a first configuration message to a plurality of user equipments (UEs) served by the first base station, the first configuration message including first information about a first offset value to trigger transmission of afirst measurement report; receiving a first measurement report from a UE among the plurality of UEs based on the first configuration message; sending a second configuration message to the UE, the second configuration message including second information about a second offset value to trigger sending of a second measurement report; and receiving a second measurement report from the UE based on thesecond configuration mess