A network node for a wireless communication system is provided. The first network node comprises a processor configured to obtain channel quality information for a user device, obtain a load information for first radio access resources, determine a first association of the first radio access resources to the user device based on the channel quality information and the load information, the first association being valid during a first validity time period, compute first user data rates for the first radio access resources based on the channel quality information, determine a utilization of the first radio access resources based on the first association and the first user data rates. A corresponding method, a wireless communication system, a computer program, and a computer program product are also provided.