[Olsr-dev] mac80211 / link-bandwith from userlandforcostcalculation / plugin

[Rogge Henning]

> > > maybe there is no need for link-loss (and therefore combining), 
> > > because minstrel already finds the "best" rate?
> > > (but needs some data-transfer in regular intervals)
> 
> > This would only work if you send some IP packets over every 
> discovered 
> > unicast link every few seconds. Not difficult to do, but without 
> > traffic on the link minstrel does not work.
> 
> hmm, it should be ok, to send every minute some small 
> unicast-packets - the higher the rate, the more often we can 
> send a packet.
> (so we do not waste time on 1mbit-links, but its not a 
> problem on an 48mbit-link to have some data every 10? seconds)
don't forget that all WLAN packets have a prefix which is send with a static datarate... but you are right, the amount of measuring packets could depend on the speed of the link. The only problem with this is that we could not use the OLSR TCs/Hellos anymore for measuring the link quality, because they are broadcast packets.

That's why I would prefer combining the broadcast lossrate with some unicast probing packets for detecting the link speed.

Henning Rogge

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Diplom-Informatiker Henning Rogge , Fraunhofer-Institut für 
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