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Re: [rmcat] I-D Action: draft-dt-rmcat-feedback-message-04.txt

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Mon, 30 October 2017 07:36 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "rmcat@ietf.org" <rmcat@ietf.org>, Zaheduzzaman Sarker <zaheduzzaman.sarker@ericsson.com>, "csp@csperkins.org" <csp@csperkins.org>, "varun.singh@iki.fi" <varun.singh@iki.fi>, "mramalho@cisco.com" <mramalho@cisco.com>
Thread-Topic: [rmcat] I-D Action: draft-dt-rmcat-feedback-message-04.txt
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Subject: Re: [rmcat] I-D Action: draft-dt-rmcat-feedback-message-04.txt
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Hi

Read through the draft and I believe that I understand how it should be implemented and when time permits I will replace the home-brewn RTCP feedback that is currently used with SCReAM with the version that is specified in the dt draft.

There are a few questions though.
1)  Arrival time offset (ATO) and Report timestamp (RTS): The time granularity of the ATO is 1ms while the time granularity of the RTS seems to be 0.1ms or can even be configurable?. Is there any reason to have a differing time granularity for ATO and RTS?

2) Byte order for ATO and RTS is not specified. I guess it should be network byte order for both RTS and ATO, right ?. 

/Ingemar 

> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: den 27 oktober 2017 20:55
> To: i-d-announce@ietf.org
> Cc: rmcat@ietf.org
> Subject: [rmcat] I-D Action: draft-dt-rmcat-feedback-message-04.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the RTP Media Congestion Avoidance Techniques
> WG of the IETF.
> 
>         Title           : RTP Control Protocol (RTCP) Feedback for Congestion Control
>         Authors         : Zaheduzzaman Sarker
>                           Colin Perkins
>                           Varun Singh
>                           Michael A. Ramalho
> 	Filename        : draft-dt-rmcat-feedback-message-04.txt
> 	Pages           : 10
> 	Date            : 2017-10-27
> 
> Abstract:
>    This document describes a feedback message intended to enable
>    congestion control for interactive real-time traffic.  The RTP Media
>    Congestion Avoidance Techniques (RMCAT) Working Group formed a
> design
>    team to analyze feedback requirements from various congestion control
>    algorithms and to design a generic feedback message to help ensure
>    interoperability across those algorithms.  The feedback message is
>    designed for a sender-based congestion control, which means the
>    receiver of the media will send necessary feedback to the sender of
>    the media to perform the congestion control at the sender.
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-dt-rmcat-feedback-message/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-dt-rmcat-feedback-message-04
> https://datatracker.ietf.org/doc/html/draft-dt-rmcat-feedback-message-04
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-dt-rmcat-feedback-message-04
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>

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