1. A method for use in a network covering a region, said region comprising a plurality of areas, a user being assigned to at least one of said area and having associated therewith a plurality of candidate areas to which the user may be assigned, said method comprising the steps of: receiving information identifying said plurality of candidate areas; estimating for each candidate area a parameter, said parameter assuming that said user is assigned to said candidate area; and prioritising said plurality of candidate areas which takes into account the estimated value of said parameter.