A method, network, and device for measuring and analyzing packet-switched traffic in a packet-switched radio telecommunication network. When cell-level location information for a mobile station (1) changes due to a handover, the location information is transmitted toward a packet core network (9) by adding the information to userplane packet headers such as a GPRS Tunneling Protocol (GTP) header (26). The measurement device measures the cell-level location information at a level (15b) in the network where the information from a plurality of mobile stations (1) is aggregated, together with PDP context information prior to analyzing information for the entire network.