A method and system guarantees a certain throughput on the Abis interface of the base station for real time traffic. The method includes the steps of providing an admission control and resource reservation for radio resources; providing an admission control for the Abis interface by determining the used resources of the Abis interface, determining the needed resources for a desired throughput of a connection, and accepting the connection if the amount of the needed Abis resources is smaller than the difference between the available Abis resources and the used Abis resources; and utilizing the results of the admission control for the Abis interface as network design parameters for providing a resource reservation for Abis resources.