1. A method comprising: obtaining information on one or more positions 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 one or more positions and the selected a-priori information, wherein a weight assigned to the selected a-priori information in estimating the value of the at least one parameter is inversely proportional to a number of one or more positions obtained; and causing a storage of the value of the at least one parameter representing the coverage area of the communication node.