[e2e] RED-->ECN

[Frank Kelly]

If RED/ECN succeed in achieving smaller queue sizes, 
then fluctuations in queue sizes may become so fast that 
only some form of average is relevant for the stability 
of feedback control loops that include propagation delays. 

Should the averaging be done at the queues or at the 
end-systems? An advantage of using end-systems is that it 
is then easier to relate the time-constants implicit in 
any averaging to propagation delays.

Some references on the impact of propagation delays on 
network stability are

End-to-End Congestion Control for the Internet: 
Delays and Stability by R. Johari and D. Tan 
http://www.statslab.cam.ac.uk/cgi-bin/resreps.pl?term=2000-2&field=number

Stability of Distributed Congestion Control with 
Heterogeneous Feedback Delays by L. Massoulie
http://research.microsoft.com/scripts/pubs/view.asp?TR_ID=MSR-TR-2000-111

Frank Kelly
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web:    www.statslab.cam.ac.uk/~frank/ 
email:  f.p.kelly at statslab.cam.ac.uk  
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