"Pre-Congestion Notification (PCN) Architecture", Philip Eardley, 20-Oct-08. ( bytes)

This document describes a general architecture for flow admission and termination based on pre-congestion information in order to protect the quality of service of established inelastic flows within a single DiffServ domain.Status

"Baseline Encoding and Transport of Pre-Congestion Information", T Moncaster, Bob Briscoe, Michael Menth, 14-Oct-08. ( bytes)

Pre-congestion notification (PCN) provides information to support admission control and flow termination in order to protect the Quality of Service of inelastic flows. It does this by marking packets when traffic load on a link is approaching or has exceeded a threshold below the physical link rate. This document specifies how such marks are to be encoded into the IP header. The baseline encoding described here provides for only two PCN encoding states. It is designed to be easily extended to provide more encoding states but such schemes will be described in other documents.

"Marking behaviour of PCN-nodes", Philip Eardley, 20-Oct-08. ( bytes)

This document standardises the two marking behaviours of PCN-nodes: threshold marking and excess traffic marking. Threshold marking marks all PCN-packets if the PCN traffic rate is greater than its configured rate. Excess traffic marking marks a proportion of PCN- packets, such that the amount marked equals the traffic rate in excess of its configured rate. Setting the configured rates below the physical link rates enables PCN-nodes to provide information to support admission control and flow termination in order to protect the quality of service of established inelastic flows.

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