1. A method of clustering position determination for providing position determination assisting data in a cellular communication network, comprising: detecting, by a radio network controller (RNC), an event; providing, by the RNC, a tag for the detected event, the tag comprising event-specific information and a time; providing, by the RNC, high-precision position measurements for the detected event; repeating, by the RNC, the detecting and providing steps a plurality of times; obtaining, by the RNC, a local event cluster of high-precision position measurements based on the tag; and tracking, by the RNC, a movement of the local event cluster by determining a geographical position by calculating a center of gravity of the local event cluster, generating, by the RNC, an updated local event cluster by removing a high-precision measurement from the local event cluster when an age of the high-precision measurement is greater than a predetermined threshold, and determining a geographical position of the updated local event cluster by recalculating the center of gravity.