A method and arrangement for controlling a balance between Packet Switched (PS) data, and Circuit Switched (CS) data in a cellular communication network. A network node is arranged in a cellular communication network to control communication of PS data between a first UE and a base station, and to control communication of CS data between a second UE and the base station. Both the first UE, the second UE and the base station are associated to the cellular communication network and are located in the cell. The network node comprises a controller 402 which is adapted to identify a risk of congested communication of data, and a transceiver 406 which is adapted to communicate PS data with the first base station, and to communicate CS data with the second base station. The controller is further adapted to request the second UE to change communication settings, and the controller is further adapted to reallocate transmission resources from the second UE, to the first UE.