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I-D ACTION:draft-ietf-rmt-bb-pgmcc-02.txt,.ps



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Reliable Multicast Transport Working Group of the IETF.

	Title		: PGMCC single rate multicast congestion control: 
                          Protocol Specification
	Author(s)	: L. Rizzo, G. Iannaccone, L. Vicisano, M. Handley
	Filename	: draft-ietf-rmt-bb-pgmcc-02.txt,.ps
	Pages		: 22
	Date		: 2003-7-1
	
This document describes PGMCC, a single rate multicast
congestion control scheme which is TCP-friendly and achieves
scalability, stability and fast response to variations in
network conditions. PGMCC is suitable for both non-reliable
and reliable data transfers.  It is mainly designed for NAK-
based multicast protocols, and uses a window-based, TCP-like
control loop using positive ACKs between one representative of
the receiver group (the ACKER) and the sender.  The ACKER is
selected dynamically and may change over time.
PGMCC is made of two components: a window-based control loop,
which closely mimics TCP behaviour, and a fast and low-
overhead procedure to select (and track changes of) the ACKER.
The scheme is robust to measurement errors, and supports fast
response to changes in the receiver set and/or network
conditions.

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