A method for performing load balancing of data flows from a user equipment (UE) between a first radio access network and a second radio access network, wherein the UE is attached to the said first radio access network, the method comprising providing preference data from the first radio access network to the UE representing radio related parameters, determining the presence of an access network discovery and selection function (ANDSF) of the UE, evaluating, at the UE, including using ANDSF if present, the preference data to determine if a data flow can be offloaded to the second radio access network, and on the basis of the evaluation, offloading a data flow of the UE from the first radio access network.