Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions (RFC8083)
Original Publication Date: 2017-Mar-01
Included in the Prior Art Database: 2017-Mar-08
Internet Society Requests For Comment (RFCs)
C. Perkins: AUTHOR [+2]
The Real-time Transport Protocol (RTP) [RFC3550] is widely used in voice-over-IP, video teleconferencing, and telepresence systems. Many of these systems run over best-effort UDP/IP networks and can suffer from packet loss and increased latency if network congestion occurs. Designing effective RTP congestion control algorithms to adapt the transmission of RTP-based media to match the available network capacity while also maintaining the user experience is a difficult but important problem. Many such congestion control and media adaptation algorithms have been proposed, but to date there is no consensus on the correct approach or even that a single standard algorithm is desirable.
Internet Engineering Task Force (IETF) C. Perkins Request for Comments: 8083 University of Glasgow Updates: 3550 V. Singh Category: Standards Track callstats.io ISSN: 2070-1721 March 2017
Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions
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 these applications, then network congestion can lead to uncontrolled packet loss and a resulting deterioration of the user's multimedia experience. The congestion control algorithm acts as a safety measure by stopping RTP flows from using excessive resources and protecting the network from overload. At the time of this writing, however, while there are several proprietary solutions, there is no standard algorithm for congestion control of interactive RTP flows.
This document does not propose a congestion control algorithm. It instead defines a minimal set of RTP circuit breakers: conditions under which an RTP sender needs to stop transmitting media data to protect the network from excessive congestion. It is expected that, in the absence of long-lived excessive congestion, RTP applications running on best-effort IP networks will be able to operate without triggering these circuit breakers. To avoid triggering the RTP circuit breaker, any Standards Track congestion control algorithms defined for RTP will need to operate within the envelope set by these RTP circuit breaker algorithms.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8083.
Perkins & Singh Standards Track [Page 1]
RFC 8083 RTP Circuit Breakers March 2017
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