1. A method for determining network parameters to be used by a wireless terminal, the method being performed by a network node, the method comprising: acquiring network traffic history data, each entry of which relating to network parameters of traffic flows between a network node and a wireless terminal; determining a number of clusters to be used for representing the network traffic history data, wherein the clusters comprise grouped sets of the network traffic history data based on a generic utility function representing at least one network parameter of said network parameters of traffic flows; associating each entry of the acquired network traffic history data with one of said number of clusters by performing constrained clustering of the acquired network traffic history data, wherein the constrained clustering is constrained using a biased distance measure between the network parameters of traffic flows of the acquired network traffic history; and associating each cluster of the clusters with network parameters to be used by a wireless terminal based on the network traffic history data associated with each cluster of the clusters.