A method of performing measurements by a user equipment, UE, in a wireless communication system, the method comprising: receiving, from a base station, a measurement control message to perform a measurement on at least one specific frequency band of a plurality of frequency bands other than at least one serving frequency band for the UE; transmitting, by the UE to the base station, information indicating applicability of a compressed mode on carriers corresponding to the at least one specific frequency band to the base station in response to receiving the measurement control message; determining whether the at least one specific frequency band is one of frequency bands that are previously configured to the UE; determining whether a measurement type is an inter-frequency measurement or an inter-radio access technology, RAT, measurement based on the measurement control message, if the at least one specific frequency band is one of configured frequency bands that are previously configured to the UE; determining whether a compressed mode is required for all of the at least one serving frequency band or the compressed mode is required for the at least one specific frequency band based on capabilities of the UE and the information indicating applicability of the compressed mode, if the measurement type is the inter-frequency measurement or the inter-RAT measurement; applying the compressed mode only to the at least one specific frequency band except for the remaining frequency bands from the plurality of frequency bands, if the compressed mode is not required for all of the at least one serving frequency band; and performing the measurement for the at least one specific frequency band to which the compressed mode is applied, except for the remaining frequency bands, wherein the capabilities of the UE comprises information indicating that the UE is capable to measure more than on frequency band or the UE is capable to measure at least one contiguous frequency of the at least one specific frequency band, wherein the compressed mode is applied according to compressed mode transmission gap patterns for carriers that belong to the at least one specific frequency band, the compressed mode transmission gap patterns being configured per carrier or group of carriers, and wherein the serving frequency band is associated with a serving cell configured to the UE. receiving, from a base station, a measurement control message to perform a measurement on at least one specific frequency band of a plurality of frequency bands other than at least one serving frequency band for the UE; transmitting, by the UE to the base station, information indicating applicability of a compressed mode on carriers corresponding to the at least one specific frequency band to the base station in response to receiving the measurement control message; determining whether the at least one specific frequency band is one of frequency bands that are previously configured to the UE; determining whether a measurement type is an inter-frequency measurement or an inter-radio access technology, RAT, measurement based on the measurement control message, if the at least one specific frequency band is one of configured frequency bands that are previously configured to the UE; determining whether a compressed mode is required for all of the at least one serving frequency band or the compressed mode is required for the at least one specific frequency band based on capabilities of the UE and the information indicating applicability of the compressed mode, if the measurement type is the inter-frequency measurement or the inter-RAT measurement; applying the compressed mode only to the at least one specific frequency band except for the remaining frequency bands from the plurality of frequency bands, if the compressed mode is not required for all of the at least one serving frequency band; and performing the measurement for the at least one specific frequency band to which the compressed mode is applied, except for the remaining frequency bands, wherein the capabilities of the UE comprises information indicating that the UE is capable to measure more than on frequency band or the UE is capable to measure at least one contiguous frequency of the at least one specific frequency band, wherein the compressed mode is applied according to compressed mode transmission gap patterns for carriers that belong to the at least one specific frequency band, the compressed mode transmission gap patterns being configured per carrier or group of carriers, and wherein the serving frequency band is associated with a serving cell configured to the UE.