A first network access node for a wireless communication system obtains a set of first radio service information (RSI) for a set of first position information in a service area. Each first RSI of the set of first RSI comprises a first RSI estimate, a first estimate type indicating how the first RSI estimate was estimated, and a first radio service type defining the first RSI estimate. The first network access node further receives a first control message from a second network access node. Corresponding methods and computer program products are also described.