Hmm, I'm very dubious of this "Triangulate the Mobile Phone Idea".
I didn't think this was possible with GSM alone. At least not to the degree
of accuracy needed to find someone in a cab.
( This is one of the reasons US GSM networks may have to combine with GPS
so as to comply with the E911 directive which requires that the exact
location of 911 calls from mobiles can be determined.)
At the very best I suspect that in Dublin, they simply narrow it down to a
single GSM Cell. Then you give the full details when a taxi in that area
rings you back.
I'm not sure what the size of a GSM cell is but I suspect it is fairly big
especially since not all GSM mobiles support 1800Mhz yet.
Overall though I like the idea, just suspect the Marketing guys have been
let loose on the technical details.
Just my 2p,
From: Donncha O Caoimh [SMTP:donncha.ocaoimh at tradesignals.com]
Sent: 13 July 2001 15:20
To: social at linux.ie
Subject: [ILUG-Social] Getting a cab in Dublin..
"From next month, you'll be able to summon a cab in Dublin by simply
sending a text message. E-Taxis has 1,000 new cars ready to hit the
streets and life will never be the same again, it told The Guardian."
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