A method of determining a position of a mobile telecommunication device which transmits a signal 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 at two or more base stations (1, 2,...) wirelessly via an antenna (11, 12, 13) of the base station (1, 2,...), • providing a reference signal (S') at the base stations, • correlating the signal 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 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 with the receivers (21, 22,..), • deriving digitized signals from the signals 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 at two or more base stations (1, 2,...) wirelessly via an antenna (11, 12, 13) of the base station (1, 2,...), • providing a reference signal (S') at the base stations, • correlating the signal 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 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 with the receivers (21, 22,..), • deriving digitized signals from the signals 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.