US Patent 9894640 Carrier grouping in multicarrier wireless networks

A base station transmits an RRC message to modify a first cell group of a first cell. If the first cell is a primary cell, the RRC message reconfigures the primary cell with an updated first cell group and the RRC message comprises mobility control information. If the first cell is a secondary cell, the RRC message releases the secondary cell and adds the secondary cell with an updated first cell group without employing mobility control information.