Re: [dccp] DCCP Media Guide

[Damon Lanphear <damonlan@real.com>]

I've cut out the cross posting to avt and mmusic.  I assume the folks
who care about congestion control are on this list...

You raise a relevant point for media applications.  We have seen this
problem manifest for very popular live media events transmitted through
a bottleneck link that must also support competing TCP flows. Its a very
realistic problem.  
  
My reading of your draft is such that you are suggesting an application
with real time constraints send at up to twice the rate required to meet
those constraints while being *limited* by the congestion controlled
rate imposed by DCCP.  If this the case, then I don't see any obvious
problems with your proposal.   The congestion controlled rate is
observed in all cases.

On Wed, 2003-11-19 at 10:02, Phelan, Tom wrote:
> Hi,
> 
> I've sent "Strategies for Media Applications Using DCCP" to the
> Internet-Drafts archive.  While we're waiting for it to be added, it's also
> available at http://www.phelan-4.com/dccp/draft-phelan-dccp-media-00.txt.
> The plan is that this will soon evolve into a general DCCP User Guide.
> 
> Abstract:
>    This document discusses strategies for using DCCP as the transport
>    protocol for streaming media applications.  Of particular interest is
>    how media streams can be adapted to the smoothly varying transmit
>    rate requirements of CCID3, or TCP-Friendly Rate Control (TFRC).
>    Also explored is the resulting network behavior of streams using
>    these strategies and the fairness between these streams and TCP-based
>    streams.
> 
> Comments will be appreciated.  In particular, I make the suggestion that
> media apps should transmit at up to twice their nominal maximum rate, when
> DCCP allows it, in order to provide protection from competing TCP
> applications.  I know that the first time I heard someone make a similar
> suggestion I was horrified, but as I developed the issues it seemed to be
> necessary.  Reactions to this will be appreciated.
> 
> Tom P.
> 
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-- 
Damon Lanphear <damonlan@real.com>


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