Am Di 22. April 2008 schrieb Andy Green: > Somebody in the thread at some point said: > > | Highly problematic it seems to me to do this forced cell reselect > thing to get > | TA for other than the current (most nearby) cell, the function named "BTS > | test" on Nokia monitor [Display 17]. Probably that's about as illegal as > | using police frequencies to mess around with, or creating your own > | TV-station. In the end they might accuse you for tearing down the > whole GSM > | network by fraudulent or abusive usage. > > Well the impact of it is interesting if you don't have distance > information from all but one transponder... you end up with a highly > variable shape that is the intersection of all the circles (because you > don't know the radius from the centre of each you should use), with one > master annulus cutting through it from the station you are connected to > and have a solid distance estimate for. > > Put together the result is an arc of shorter or longer length describing > your location... if the arch length is small because the other stations' > intersection is small, it's as good as a point location. If there's > only one other base station around anyway, the arc may be 2/3 of the > circle and if your station is the only one, it is the whole annulus. > But normally your location would appear as a little rainbow segment of > one length or another.
Yep, exactly. I only hesitated to try and describe it this precise way ;-) But usually it should be fairly small area and thus rather precise location. /j
