PCT No. PCT / SE96 / 00210 Sec. 371 Date Aug. 15, 1997 Sec. 102(e) Date Aug. 15, 1997 PCT Filed Feb. 16, 1996 PCT Pub. No. WO96 / 25830 PCT Pub. Date Aug. 22, 1996The position of a
mobile station in a cellular mobile telephone
system, particularly a
GSM system, is determined by carrying out a simulated
call setup, i.e., the
call setup is interrupted subsequent to a
telephone switching center (MSC) having received a
paging response containing the identity of the
cell and, optionally, a
timing advance. The simulated
call setup is initiated by generating a modified short message
signal (SMS) which is not registered in the SMS catalogue of the
mobile station and which is not shown to the user of the
mobile station. The SMS commands the mobile
station to carry out a position determining sequence in order to establish parameters for use in establishing the position of the mobile
station, for example by commanding the mobile
station to connect itself to a
base station contained in its neighbor
list, analyze the geographical position of the
base station, and subsequently send the position determining parameters to a position handler. The geographical position of the
base station is analyzed from the
cell identity and, if available, the
timing advance, the position of the mobile station being presented graphically on a picture screen and constantly updated after each call setup. The call setups are generated by the position handler.