From: Johan Bengtsson (Johan.E.Bengtsson@telia.se)
Date: Thu Sep 06 2001 - 14:32:11 MET DST 


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Dick, 


Fill me in; what is "Johansson's Algorithm" [reference]? If it some magic method 
to position devices, we at Telia Research are very interested! ;-) 


// Johan 


Dick Schefström wrote: 


> As some of us has discussed a few times there is an interesting 
> opprtunitry to automatically gather radio coverage information 
> just as a side effect of users moving around. 
> 
> Assuming that at least some clients knows two things: 
> 
> 1, its position, by Johansson's Algorithm or through GPS, 
> 2, its experienced signal quality at that position, 
> 
> ...then we can let each of them send the data pair 
> (Position, Signal Strength) 
> with certain intervals, and automatically build up a 
> map of the radio coverage situation. This can then be used 
> in several ways: 
> 
> 1. Just providing the user with that info, probably painted 
> on a suitable map, as to know what to expect. Quality of Service 
> is to some extent a question of expectations. If the user 
> knows about variations, he will feel like the overall quality is 
> anyway better than if he didn't know. 
> 2, Directly hint the user of "moving 20 meters north" to 
> improve connection. 
> 3. Increase precision of signal-strength based positioning 
> by comparing actual signal strength with previously mesured. 
> 
> The approach taken here is also principally interesting, since it 
> meets the goal of the "self-organizing system". No central authority is 
> needed, but information is gathered automatically just as an invisible 
> side effect of the little user-ants working around. Statistics say that 
> quality 
> only improves as times go by. Distributed Systems. Aren't they 
> beautiful? 
> 
> The optimal case would be portable devices with now both GPS and 
> WLan integrated. Waiting for that, we maybe could equip some "walkers" 
> with Dockers Mobile Pants and send them for healthy promenades. 
> I get to think about the Casio GPS watch that they sell at Boströms 
> Ur & Guld downtown. What if that had, eh, bluetooth? 
> 
> An interesting side effect is that we can know exactly where people 
> have been, and soon we start to think that as someone 
> goes out of coverage, there is something suspicious going on :-) :-) 
> 
> -- Dick 



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