Example embodiments presented herein are directed towards a base station (401), and corresponding method therein, for obtaining a carrier aggregation compatibility report comprising a subset of a total number of frequency band and/or frequency band combinations supported by a wireless device. Example embodiments presented herein are also directed towards a wireless device (501), and corresponding method therein, for providing a carrier aggregation compatibility report comprising a subset of the total number of frequency bands and/or frequency band combinations supported by the wireless device.