"Wiberg, Annie" wrote:
> It looks like a picture taken by a spy! Anyway, does anyone know how the
> system works and down to what sort of range it works?
I can't say for sure, but unless they've integrated a GPS receiver into
the unit (which I doubt), odds are it's just a PHS phone. PHS
base stations are microcell, so if DoCoMo knows which base station
the phone is using, it can pinpoint the user's location to a radius
of a few dozen meters. (And if the location is Shibuya's Love
Hotel Hill, odds are somebody will be in trouble when they get home...)
At any rate, this is how DoCoMo's "Imadoco Mapion" service
(http://imadoko.mapion.co.jp/) works. More technical specs
can be found in "Development and Evaluation of Context Aware
Messaging Service..." by Nakanishi et al, Proceedings of the
7th Intl. Workshop on Mob. Multimed. Comm. (2000).
Cheers,
--
Jani PATOKALLIO / jpatokal@iki.fi / +81 90 7722 3557
Sanpo Laboratory, Mechano-Informatics Dept., University of Tokyo
ヤニ・パトカリオ / jani@sanpo.t.u-tokyo.ac.jp / 090 7722 3557
東京大学、工学系研究科、機械情報工学科、算法設計研究室
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Received on Fri Nov 17 04:30:21 2000