[R-C] proposing a WG on RTP congestion control

[Zaheduzzaman Sarker]

Hi,

This is a good start. 

Some comments below-

# This WG should include a usecase document describing exactly in what cases the proposed CC mechanism will work. This will also help to understand the scope of the WG and also in finding out corner cases (especially for cellular networks). This will help forming requirements as well.

# What about evaluation criteria's of the CC algorithm? There should be clear guidelines on evaluation criteria of an CC mechanism. And that evaluation criteria could vary depending on different usecases. This is why usecases are important for such a work like this. RTCWEB has usecase document which could be a good starting place.

# As Internet is a heterogeneous network, some text regarding the heterogeneity should be there in the charter so that all access types are taken into account explicitly.

# This is not entirely true that reacting to the ECN marking does not help queuing delay (especially in case of ECN for UDP for higher bitrate traffic). Reacting to packet loss is another topic. I think "detecting and reacting to losses and ECN marks" should be separated in the charter text.

# This charter text and in the mailing list people are concern about the fairness among the flows. To me this kind of CC property does not really related particularly to RTP. Rather it is related to all transport protocols that share the bandwidth of a link. The requirements and evaluation of the CC mechanism should be based on real-time media characteristics. Then can be mapped to any proposal(or protocol) and according to the mapping if require RTP can be extended and/or new RTCP messages can be added. This will also help future IP protocol design as they designers will have some references to consider.

# I expect this work to be collaborated with CONEX WG as well. They might have input for this work especially when we talk about fairness among the flows. 


BR

Zahed


ANM ZAHEDUZZAMAN SARKER M.Sc.
Experienced Researcher

Ericsson AB
Multimedia Technologies (MMT)
Ericsson Research
P.O. Box 920, SE-971 28, Luleå, Sweden
Phone +46 10 717 37 43
Fax +46 920 996 21
SMS/MMS +46 76 115 37 43
zaheduzzaman.sarker at ericsson.com
www.ericsson.com



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-----Original Message-----
From: rtp-congestion-bounces at alvestrand.no [mailto:rtp-congestion-bounces at alvestrand.no] On Behalf Of Wesley Eddy
Sent: den 2 januari 2012 19:56
To: rtp-congestion at alvestrand.no
Subject: [R-C] proposing a WG on RTP congestion control

Hello all, following up on our discussion in Taipei, I have proposed a working group in the TSV area to work on RTP congestion control.
This is scheduled to be discussed by the IESG on 1/5 in "internal review".

The draft charter is at:
http://www.ietf.org/iesg/evaluation/rmcat-charter.txt

I would welcome participants in this list to comment on this, particularly if/when it moves to "external review", as I would expect the folks currently on this list to be some of the main participants in the proposed WG.  I had previously had this reviewed by the TSV Directorate, and got fairly good responses and strong interest expressed from many of the directorate in participating as well.

Happy New Year!

--
Wes Eddy
MTI Systems
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