@techreport{chan-pcn-problem-statement-01,
    number =    {draft-chan-pcn-problem-statement-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-chan-pcn-problem-statement/01/},
    author =    {Kwok Ho Chan},
    title =     {{Pre-Congestion Notification Problem Statement}},
    pagetotal = 17,
    year =      2006,
    month =     oct,
    day =       25,
    abstract =  {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.},
}