I-D ACTION:draft-wenger-avt-rtcp-feedback-02.txt

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	Title		: RTCP-based Feedback: Concepts and Message  Timing 
                          Rules
	Author(s)	: S. Wenger, J. Ott
	Filename	: draft-wenger-avt-rtcp-feedback-02.txt
	Pages		: 21
	Date		: 08-Mar-01
	
Real-time media streams are not resilient against packet losses. RTP
[1] provides all the necessary mechanisms to restore ordering and
timing to properly reproduce a media stream at the recipient.  RTP
also provides continuous feedback about the overall reception quality
from all receivers -- thereby allowing the sender(s) in the mid-term
(in the order of several seconds to minutes) to adapt their coding
scheme and transmission behavior to the observed network QoS.
However, except for a few payload specific mechanisms [2], RTP makes
no provision for timely feedback that would allow a sender to repair
the media stream immediately: through retransmissions, retro-active
FEC, or media-specific mechanisms such as reference picture
selection.

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