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 the steps of: 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 which number of clusters to be used for representing the network traffic history data by optimizing 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, the constrained clustering using a biased distance measure; and associating each cluster with network parameters to be used by a wireless terminal based on the network traffic history data associated with each cluster.