A domain manager (320) of a Radio Access Network, RAN, determines a configuration of a RAN resource partition of a network slice. The configuration defines which network elements of the RAN are assigned to the RAN resource partition of the network slice. The domain manager (320) receives at least one report (407, 408, 409) indicating, for at least one of the network elements assigned to the RAN resource partition, an amount of traffic of the network slice handled by the network element in an observation time window. Based on the at least one report (407, 408, 409), the domain manager (320) adapts the configuration of the RAN resource partition by removing one or more of the network elements from the RAN resource partition.