On Wed, 27 Jan 1999, Phil Karn wrote:
> I still think somebody with a better handle on control theory than me
> (like someone who really knows Kalman filtering) could solve this
> problem. It's still worth doing because it'll take time to get ECN
> widely deployed.
Kalman filtering would work if there exists in your signal a true
"tendency or behavior". Unfortunately, the RTT variations in response to
the variation of number of packets in flight are most of the time
uncorrelated. For example, increasing the number of packets in flight may
result in an increase of RTT as well as in a decrease of RTT. This is due,
as noted in many previous emails, to the fact that RTT variations may be
due to many, many other reasons other than increasing or decreasing (by
the sender) the number of packets in flight.
> Phil
>
>
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