Tracking a mobile station, MS, (108) of a telecommunications network including a LCS client (102), Location services client, for a GMLC, Gateway Mobile Location Center, (104). The GMLC (104) checking a prediction database to find a predicted location area of the MS. If the prediction data is valid then location estimation procedure will not be started, the GMLC (104) requesting an MSC 106 to forward the location update information to the GMLC (104) for the MS (108). In case an location area update is done before an end of a prediction period and the MS (108) moves out of the predicted area then an location estimation procedure will be started for the MS (108).