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Re: WiFi access point for students

On Fri, Nov 05, 2010 at 08:16:22AM +0100, José L. Redrejo Rodríguez wrote:
El jue, 04-11-2010 a las 20:04 +0100, Jonas Smedegaard escribió:
On Thu, Nov 04, 2010 at 02:22:18PM +0100, José L. Redrejo Rodríguez wrote:
>Anyway, you've forgotten the main difference between a school and a >hotel/restaurant setup: the number of concurrent users. Think of a >school with only 10 classrooms, 25 pupils per classroom: 260 >laptops. As soon as most laptops are in the school, you will soon >run out of available wireless channels, and available bandwith.

Interesting point about amount of users essentially flooding the radios.

This issue is of concern for the One Laptop Per Child project too, and its sister-project, Sugar, too. I recall it being discussed recently (2-4 months ago, I believe - tell me if anyone wants me to locate it more exactly) and a proposed solution was to turn *down* the power of the radio chips, so as to cover smaller areas per AP, instead of wasting radio bandwidth by overlapping too much. If I recall correctly, the proposal originates from the german Freifunk project which apparently have had success with setting up AP software to dynamically lower the radio power to the least needed depending on some usage patterns.

That's very interesting, we have also thought of reduce the power of the AP and the laptops radios. A dynamic solution would be fantastic but I don't know how it can be done. What parameters could be taking to calculate the needed power? Do you have a link with more information about the possible algorithm?


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- Jonas

 * Jonas Smedegaard - idealist & Internet-arkitekt
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