I-D ACTION:draft-briscoe-tsvwg-cl-phb-02.txt

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	Title		: Pre-Congestion Notification marking
	Author(s)	: B. Briscoe, et al.
	Filename	: draft-briscoe-tsvwg-cl-phb-02.txt,.pdf
	Pages		: 48
	Date		: 2006-6-28
	
Pre-Congestion Notification (PCN) builds on the concepts of RFC 3168, 
"The addition of Explicit Congestion Notification to IP". However, 
Pre-Congestion Notification aims at providing notification before any 
congestion actually occurs. Pre-Congestion Notification is applied to 
real-time flows (such as voice, video and multimedia streaming) in 
DiffServ networks. As described in [CL-DEPLOY], it enables "pre" 
congestion control through two procedures, flow admission control and 
flow pre-emption. The draft proposes algorithms that determine when a 
PCN-enabled router writes Admission Marking and Pre-emption Marking 
in a packet header, depending on the traffic level. The draft also 
proposes how to encode these markings. We present simulation results 
with PCN working in an edge-to-edge scenario using the marking 
algorithms described. Other marking algorithms will be investigated 
in the future.

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