A method of operation of a network node in a cellular communications network , comprising: determining whether a wireless device that is configured with a serving cell that operates on a first frequency is synchronized to a non-serving cell that operates on a second frequency, the second frequency being a non-serving frequency; determining whether to configure the wireless device to apply a first measurement gap configuration or a second measurement gap configuration based upon whether the wireless device is synchronized to the non-serving cell that operates on the second frequency, the first measurement gap configuration and the second measurement gap configuration being different measurement gap configurations; and transmitting information to the wireless device that configures the wireless device to apply the first measurement gap configuration or the second measurement gap configuration as determined by the network node , wherein determining whether to configure the wireless device to apply the first measurement gap configuration or the second measurement gap configuration comprises: determining to configure the wireless device to apply the first measurement gap configuration upon determining that the wireless device is synchronized to the non-serving cell that operates on the second frequency; and determining to configure the wireless device to apply the second measurement gap configuration upon determining that the wireless device is not synchronized to the non-serving cell that operates on the second frequency. determining whether a wireless device that is configured with a serving cell that operates on a first frequency is synchronized to a non-serving cell that operates on a second frequency, the second frequency being a non-serving frequency; determining whether to configure the wireless device to apply a first measurement gap configuration or a second measurement gap configuration based upon whether the wireless device is synchronized to the non-serving cell that operates on the second frequency, the first measurement gap configuration and the second measurement gap configuration being different measurement gap configurations; and transmitting information to the wireless device that configures the wireless device to apply the first measurement gap configuration or the second measurement gap configuration as determined by the network node , wherein determining whether to configure the wireless device to apply the first measurement gap configuration or the second measurement gap configuration comprises: determining to configure the wireless device to apply the first measurement gap configuration upon determining that the wireless device is synchronized to the non-serving cell that operates on the second frequency; and determining to configure the wireless device to apply the second measurement gap configuration upon determining that the wireless device is not synchronized to the non-serving cell that operates on the second frequency. determining to configure the wireless device to apply the first measurement gap configuration upon determining that the wireless device is synchronized to the non-serving cell that operates on the second frequency; and determining to configure the wireless device to apply the second measurement gap configuration upon determining that the wireless device is not synchronized to the non-serving cell that operates on the second frequency. <EOS>