Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt
Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 20 October 2015 11:08 UTC
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To: Colin Perkins <csp@csperkins.org>, "avt@ietf.org WG" <avt@ietf.org>
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Date: Tue, 20 Oct 2015 13:08:48 +0200
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt
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WG, I want to stress that I personally think this looks pretty well baked and my high level issues are resolved. I also think what is in this document is actually implementable, however that is without having implemented. I really want to encourage that you review this now! Cheers Magnus Westerlund AVTCORE chair Den 2015-10-19 kl. 12:17, skrev Colin Perkins: >> On 16 Oct 2015, at 17:30, Internet-Drafts@ietf.org wrote: >> >> >> A New Internet-Draft is available from the on-line Internet-Drafts directories. >> This draft is a work item of the Audio/Video Transport Core Maintenance Working Group of the IETF. >> >> Title : Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions >> Authors : Colin Perkins >> Varun Singh >> Filename : draft-ietf-avtcore-rtp-circuit-breakers-11.txt >> Pages : 23 >> Date : 2015-10-16 >> >> Abstract: >> The Real-time Transport Protocol (RTP) is widely used in telephony, >> video conferencing, and telepresence applications. Such applications >> are often run on best-effort UDP/IP networks. If congestion control >> is not implemented in the applications, then network congestion will >> deteriorate the user's multimedia experience. This document does not >> propose a congestion control algorithm; instead, it defines a minimal >> set of RTP circuit-breakers. Circuit-breakers are conditions under >> which an RTP sender needs to stop transmitting media data in order to >> protect the network from excessive congestion. It is expected that, >> in the absence of severe congestion, all RTP applications running on >> best-effort IP networks will be able to run without triggering these >> circuit breakers. Any future RTP congestion control specification >> will be expected to operate within the constraints defined by these >> circuit breakers. >> >> >> The IETF datatracker status page for this draft is: >> https://datatracker.ietf.org/doc/draft-ietf-avtcore-rtp-circuit-breakers/ >> >> There's also a htmlized version available at: >> https://tools.ietf.org/html/draft-ietf-avtcore-rtp-circuit-breakers-11 >> >> A diff from the previous version is available at: >> https://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-rtp-circuit-breakers-11 > > This version of the draft is a major update, that makes the following changes: > > - Update the media timeout circuit breaker to address the over- and under-sampling issues raised by Magnus Westerlund, by taking into account the RTT and RTP framing interval in the calculation, as well as the RTCP reporting interval. > > - Update the congestion circuit breaker to address the over- and under-sampling issues raised by Magnus Westerlund, and to account for codecs that cannot change their rate on each frame, by modifying the definition of CB_INTERVAL to include the RTP framing interval, the frame group size, and the RTT in the calculation, as well as the RTCP reporting interval. > > - Collect definitions and clarify terminology. > > - Clarify behaviour when interworking with systems that don’t implement RTCP, based on feedback by Simon Perreault. > > - Remove discussion on Impact of RTCP Reporting Groups, that seemed to confuse rather than clarify. > > - Various editorial fixes to address other review comments by Simon Perreault, and make assorted other corrections. > > Feedback welcome. > > Colin > > > > -- Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circ… internet-drafts
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-… Colin Perkins
- Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-… Magnus Westerlund