A method for deactivated secondary Component Carrier (CC) measurement in a communications apparatus providing wireless communications services via a first CC in a wireless network includes: determining a switch timing to perform bandwidth extension or frequency adjustment required for performing a deactivated secondary CC measurement; extending an operation bandwidth or adjusting a center frequency of at least one signal processing component included in the communications apparatus at the switch timing, wherein an operation band defined by the operation bandwidth and the center frequency of the signal processing component covers at least a bandwidth of the secondary CC; and performing the deactivated secondary CC measurement after extending the operation bandwidth or adjusting the center frequency. The secondary CC is not able to perform data transmission or reception during a deactivated state.