1. A method comprising: obtaining information on at least one position stored for a communication node and at least one criterion that is met by the communication node; selecting a-priori information on a coverage area size that is stored for communication nodes meeting the at least one criterion, wherein different a-priori information is stored for communication nodes meeting different criteria; estimating a value of at least one parameter representing a coverage area of the communication node based on the obtained information on the at least one position and the selected a-priori information; and causing a storage of the value of the at least one parameter representing the coverage area of the communication node.