[R-C] Request for agenda time in Paris to discuss RTP congestion control proposals

[Michael Welzl]

Hi!

Fine by us, and certainly a welcome topic in ICCRG. We can give you a 1 
hour slot within our meeting.

Cheers,
Michael


On 2/29/12 1:19 PM, Harald Alvestrand wrote:
> Hello,
>
> our transport AD, Wesley Eddy, suggested I should contact you about 
> the issue of getting discussion time at the Paris IETF for the problem 
> of congestion control for RTP-carried real-time media.
>
> We (a small group of people working on the 
> rtp-congestion at alvestrand.no mailing list) have come up with a few 
> drafts, mainly based on work done at Global IP Sound and Google:
>
> - draft-alvestrand-rtcweb-congetsion-01
> - draft-alvestrand-rmcat-remb-00
>
> These drafts suggest that one implement a delay-based, 
> recipient-measured estimation algorithm for bandwidth estimation over 
> RTP flows, and define a feedback message (analogous to TMMBR) for the 
> recipient telling the sender how much data to send at any time.
>
> There has also been discussion on the rtcweb mailing list about the 
> desirable properties of such congestion control, including how it 
> should interact with congestion control in SCTP, which is suggested 
> for a data channel transport in the RTCWEB effort.
>
> In an informal lunch meeting in Taipei, we discussed having a 
> three-pronged approach:
>
> - Defining a set of best practices for what one should really not do 
> with RTP flows (such as saying "when packet loss exceeds some 
> percentage, reduce send rate significantly"); this seems like 
> appropriate work for AVTCORE
>
> - Define a set of feedback messages that can be used to implement 
> algorithms like the one mentioned above, or others, without 
> standardizing the algorithm itself
>
> - Creating a working group for publishing the ideas and pushing a long 
> term effort for standardizing a congestion control algorithm. A draft 
> charter is here: http://www.ietf.org/iesg/evaluation/rmcat-charter.txt
>
> Due to bad planning, we did not get a BOF request in for the Paris 
> meeting, but would really like to have a place to have this discussion 
> in that timeframe; also, the ICCRG should have quite a few people 
> whose input we would definitely want into this discussion.
>
> Can you consider whether or not you can offer us some time on the 
> ICCRG agenda for this?
>
>                     Harald Alvestrand
>
>
>