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Title : Pre-Congestion Notification Problem Statement
Author(s) : K. Chan, et al.
Filename : draft-chan-pcn-problem-statement-01.txt
Pages : 17
Date : 2006-10-25
DiffServ mechanisms have been developed to support Quality of Service
(QoS). However, the level of assurance that can be provided with
DiffServ without substantial over-provisioning is limited. Pre-
Congestion Notification (PCN) investigates the use of per-flow
admission control to provide the required service guarantees for the
admitted traffic. While admission control will protect the QoS under
normal operating conditions, an additional flow pre-emption mechanism
is necessary in the times of heavy congestion (e.g. caused by route
changes due to link or node failure).
This document provides a problem statement on the addition of flow
admission control and flow pre-emption functionality to a DiffServ
network, in particular for the support of real time services such as
voice and video.
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