Systems and techniques for changing between secondary cells in dual connectivity communication. A user device (110A) operating in dual connectivity with a master base station (102) and a source base station (106A) transmits a change request to a target secondary base station (106B), seeking a connection change to a target base station that is to be used as the secondary base station. The target base station (106B) notifies the master base station (102) of the change request, and the master base station performs changeover operations—for example, notifying the source base station (106A) that it is no longer to be used in dual connectivity with the user device (110A) making the request, and notifying the user device (110A) that the change request has been accepted, with the user device (110A) then proceeding to establish connection with the target secondary base station (106B).