[e2e] Why do we need congestion control?

Detlef Bosau detlef.bosau at web.de
Wed Apr 3 10:41:29 PDT 2013

Am 03.04.2013 17:49, schrieb LOCHIN Emmanuel:
> Le 03.04.2013 15:40, Detlef Bosau a écrit :
>> And when the adaptation of an FEC scheme to an
>> actual link noise situation is being done best at the radio interface,
>> where the noise situation is immediately known e.g. by observation and
>> assessment of a pilot signal, adaptation should be done there and not
>> at the end points "200 ms later". Particularly, it does not make sense
>> to bother the whole network with the overhead of some extremely strong
>> FEC scheme because there is one flow which has to pass a noisy air
>> interface.
> Detlef, you now talk about link-layer FEC while at the beginning of 
> this thread and following the subject, we talk about congestion 
> control (i.e. at transport layer).

Yes. And that's part of the problem. We mix up different tasks here. 
Actually, we cannot split these tasks as clearly as we want to.
> The erasure codes presented are based at the transport or application 
> layers, for instance, to prevent retransmission due to big delay or to 
> attempt to implement anarchical network proposals.

Even for application layers we have to keep costs in mind.

Detlef Bosau
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