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[tsvwg] Comments on draft-ietf-tsvwg-l4s-arch-07

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Mon, 02 November 2020 10:39 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "Bob Briscoe (ietf@bobbriscoe.net)" <ietf@bobbriscoe.net>, "De Schepper, Koen (Koen)" <koen.de_schepper@nokia.com>, Greg White <g.white@CableLabs.com>, "marcelo@it.uc3m.es" <marcelo@it.uc3m.es>
CC: "tsvwg@ietf.org" <tsvwg@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: Comments on draft-ietf-tsvwg-l4s-arch-07
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Date: Mon, 02 Nov 2020 10:39:00 +0000
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Subject: [tsvwg] Comments on draft-ietf-tsvwg-l4s-arch-07
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Hi

 

I have read through  draft-ietf-tsvwg-l4s-arch-07 and have a few comments

 

Section 4 page 11 on Host mechanisms : RFC6679 is listed for RTP, it is however good to add also  
https://tools.ietf.org/wg/avtcore/draft-ietf-avtcore-cc-feedback-message/ , this feedback format is used with SCReAM. cc-feedback-message is BTW listed in the L4S-ID draft.

 

Section 6.2 :
+ One key benefit that I see with L4S is that it reduces delay jitter and this in turn makes it possible to tune down the dejjitterbuffers on the video streaming client side. The end result should be a better interactive experience for the end users.

 

+ Another one, that may not be useful. SCReAM implement a transmission buffer on the sending side. This prevents that traffic bloats the network in case of a fast reduction in link throughput. In addition the transmission buffer can be discarded and the video coder can be requested to create a new key frame. This happens occasionally in the experiments with the RC cars that we run because the video coders in the NVIDIA Jetson Nanos are a bit slow to react to reduced target rate. This mechanism should be improved with addition of L4S support as we can then reduce the time that the video playout freezes as the queue buildup in the network is limited.

 

Nits : 
Section 8.1 Possible grammar… not sure “as best efforts traffic”, always thought it should be “as best effort traffic” ?. But then I am not a professor in the English language 😐

 

/Ingemar

================================

Ingemar Johansson  M.Sc. 

Master Researcher

 

Ericsson Research

RESEARCHER

GFTL ER NAP NCM Netw Proto & E2E Perf

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ingemar.s.johansson@ericsson.com

www.ericsson.com <http://www.ericsson.com/> 

 

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