To prevent oscillation of the load on a radio interface between a user equipment device and a base station of a non-serving cell scheduled in a decentralized way by a base station of a serving cell, a centralized control action is performed by a radio network controller to reduce load congestion on the radio interface in the non-serving cell. Oscillation in load might otherwise exist over the radio interface due to the decentralized scheduling trying to maintain a high degree of load in all cells combined with independent control action by the non-serving cell to reduce the load congestion.