Patent attributes
A wireless device receives a first RRC message configuring a plurality of cells, a primary cell group, and a secondary cell group. The wireless device receives a second RRC message to reconfigure cell group configurations. The second RRC message is configurable to cause the modification of the cell group configuration of a secondary cell without explicitly releasing the secondary cell if the second RRC message comprises mobility control information. The second RRC message is unconfigurable to cause modification of the cell group configuration of the secondary cell without explicitly releasing the secondary cell if the RRC message does not comprise mobility control information.