A method of determining a position of a mobile telecommunication device which transmits a signal (S) to base stations (1, 2, 3, ...) connected by a data link and having known locations, the base stations (1, 2, ...) being configured to perform functions of transmission and reception of wireless signals as part of a wireless communication network operation, the method comprising the steps of: • receiving the signal (S) at two or more base stations (1, 2, ...) wirelessly via an antenna of the base station (1, 2, ...), • providing a reference signal (S') at the base stations, • correlating the signal (S) and the reference signal (S') so as to produce a correlation for each base station, • detecting a maximum in each correlation, which maximum is indicative of a time of arrival of the signal (S) at the respective base station, • deriving from the times of arrival respective distances (D1, D2, ...) to the mobile communication device and, • using the respective distances (D1, D2, ...) and the respective known locations of the base stations to derive a location of the mobile telecommunication device from the respective distances (D1, D2, ...), characterised by • providing a data network coupled to the data link , • providing receivers (21, 22, ...), which are not involved in the operation of the wireless communication network, the receivers (21, 22, ...) being coupled to the data network , • further receiving the signal (S) with the receivers (21, 22, ..), • deriving digitized signals from the signals (S) as received by each receiver (21, 22, ...) by using A/D conversion, the digitized signal being a digitized version of the received signal not obtained by reconstruction or remodulation of the received signal, and • forwarding the digitized signals, or a lossless compression thereof, from the receivers (21, 22, ..) to the base stations through the data network and the data link , • each base station (1, 2, ..) selecting the digitized signal having the highest quality for use as the reference signal (S') in said correlating step, if it receives multiple digitized signals. • receiving the signal (S) at two or more base stations (1, 2, ...) wirelessly via an antenna of the base station (1, 2, ...), • providing a reference signal (S') at the base stations, • correlating the signal (S) and the reference signal (S') so as to produce a correlation for each base station, • detecting a maximum in each correlation, which maximum is indicative of a time of arrival of the signal (S) at the respective base station, • deriving from the times of arrival respective distances (D1, D2, ...) to the mobile communication device and, • using the respective distances (D1, D2, ...) and the respective known locations of the base stations to derive a location of the mobile telecommunication device from the respective distances (D1, D2, ...), characterised by • providing a data network coupled to the data link , • providing receivers (21, 22, ...), which are not involved in the operation of the wireless communication network, the receivers (21, 22, ...) being coupled to the data network , • further receiving the signal (S) with the receivers (21, 22, ..), • deriving digitized signals from the signals (S) as received by each receiver (21, 22, ...) by using A/D conversion, the digitized signal being a digitized version of the received signal not obtained by reconstruction or remodulation of the received signal, and • forwarding the digitized signals, or a lossless compression thereof, from the receivers (21, 22, ..) to the base stations through the data network and the data link , • each base station (1, 2, ..) selecting the digitized signal having the highest quality for use as the reference signal (S') in said correlating step, if it receives multiple digitized signals. <EOS>