The present invention relates to a method and devices for allowing a communication terminal to configure a measurement gap pattern on a downlink carrier frequency for measurement on a target carrier frequency by said communication terminal, the communication terminal being capable of performing measurements on at least two downlink carrier frequencies without measurement gap, the method comprising: obtaining an indication that there is a need for the measurement gap pattern, for performing the measurement on the target carrier frequency; retrieving information about how to configure the measurement gap pattern; and determining, based on the retrieved information, the downlink carrier frequency on which the measurement gap pattern is to be configured.