Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt
Colin Perkins <csp@csperkins.org> Mon, 19 October 2015 10:17 UTC
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From: Colin Perkins <csp@csperkins.org>
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Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-rtp-circuit-breakers-11.txt
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> 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 -- Colin Perkins https://csperkins.org/
- [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