A wireless terminal device of a wireless communication system is arranged to operate according to a plurality of radio access technologies, RATs. A method of the wireless terminal device comprises receiving a configuration from a network node of an access network of the wireless communication system, wherein the configuration is a multi-connectivity configuration arranged to operate towards a plurality of RATs simultaneously, determining capabilities of the wireless terminal device, and analyzing the received configuration in view of the capabilities. If the capabilities are fully sufficient for the configuration, the configuration is used for setting up transceiver operation of the wireless terminal device, or if the capabilities are not fully sufficient for the configuration, an adapted configuration is determined for setting up the transceiver operation of the wireless terminal device, wherein the capabilities are fully sufficient for the adapted configuration. The method also comprises operating the wireless terminal device according to selected transceiver operation. Network node, and methods and computer programs therefor are also disclosed.