In a first aspect, requests for carrier aggregation scheduling for a user equipment are received (S41) from a first cell used for carrier aggregation for the user equipment in a cellular communications network and n second cells of the cellular communications network, used for the carrier aggregation. The requests include a first scheduling decision of the first cell and n second scheduling decisions of the n second cells. It is checked (S42) whether or not the requests exceed limits of the user equipment, and the n second scheduling decisions are modified (S43) according to predefined rules such that the requests do not exceed the limits of the user equipment. In a second aspect, limits of the user equipment are increased by a margin (S51), the increased limits are split onto active cells of the first and n second cells according to a predefined rule (S52), and the margin is controlled (S54) dependent on whether the increased and split limits are exceeded or not by the requests (S53). If they are exceeded, the n second scheduling decisions may be modified according to the first aspect (S43).