When it is determined that a first estimate of the total level of interference towards transmissions associated with a first access node from transmissions associated with other access nodes exceeds a predetermined target maximum value; then in dependence on the extent to which said first estimate exceeds said target maximum value, selecting one or more of said other access nodes to which to make a request to reduce the transmission power of interfering transmissions, and/or selecting an amount by which to request any one or more of said other access nodes to reduce the transmission power of interfering transmissions.