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

[Harald Alvestrand]

On 03/01/2012 09:18 AM, Michael Welzl wrote:
> Hi!
>
> Fine by us, and certainly a welcome topic in ICCRG. We can give you a 
> 1 hour slot within our meeting.
Thank you! We'll plan accordingly, and put together a sub-agenda that we 
can send you ASAP.
>
> 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
>>
>>
>>
>
>