[R-C] REMB message, SSRC list and DiffServ

[Justin Uberti]

Good point. Keep in mind that even within a single source/SSRC, packets may
be sent with different DiffServ markings (consider speech vs silent audio,
or different temporal layers for video)

On Tue, Nov 1, 2011 at 4:39 PM, Harald Alvestrand <harald at alvestrand.no>wrote:

> I just remembered one reason why we put an SSRC list in the REMB message,
> and I don't think we've mentioned this on the list....
>
> If SSRCs get sent with different DiffServ codepoints, they are going to
> experience very different congestion states at intermediate routers. It
> doesn't make sense to give feedback on them jointly or on average.
>
> We don't know yet how we should divide those SSRCs into different groups,
> but it's good to have the ability to do so without changing the signalling.
>
> The congestion state on a set of SSRCs should only be applied as a basis
> for controlling traffic over the set of data that is sent with the same
> DiffServ markings.
> (Grammar bad. I beg forgiveness, and hope the meaning carries.)
>
>                   Harald
>
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