|Authors||P. Eardley, N. Others and B. Briscoe|
|Title||Metering and Marking Behaviour of PCN-Nodes|
|Afilliation||, Communication Systems|
|Publication Type||Technical reports|
|Year of Publication||2009|
|Other Numbers||ISSN 2070-1721|
|Keywords||Admission Control, Algorithm, AQM, congestion control, Data Communication, Differentiated Services, Internet, networks, Notification, Pre-Emption, Protocol, QoS, Quality of Service, Signalling, Termination|
The objective of Pre-Congestion Notification (PCN) is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain in a simple, scalable, and robust fashion. This document defines the two metering and marking behaviours of PCN-nodes. Threshold-metering and -marking marks all PCN-packets if the rate of PCN-traffic is greater than a configured rate ("PCN-threshold-rate"). Excess-traffic-metering and -marking marks a proportion of PCN-packets, such that the amount marked equals the rate of PCN-traffic in excess of aconfigured rate ("PCN-excess-rate"). The level of marking allows PCN-boundary-nodes to make decisions about whether to admit or terminate PCN-flows.