A Survey of PCN-Based Admission Control and Flow Termination

Michael Menth, Frank Lehrieder, Bob Briscoe, Philip Eardley, Tony Moncaster, Jozef Babiarz, Anna Charny, Xinyang (Joy) Zhang, Tom Taylor, Kwok-Ho Chan, Daisuke Satoh, Ruediger Geib, Georgios Karagiannis

    Research output: Contribution to journalArticleAcademicpeer-review

    18 Citations (Scopus)
    142 Downloads (Pure)


    Pre-congestion notification (PCN) provides feedback about load conditions in a network to its boundary nodes. The PCN working group of the IETF discusses the use of PCN to implement admission control (AC) and flow termination (FT) for prioritized realtime traffic in a DiffServ domain. Admission control (AC) is a well-known flow control function that blocks admission requests of new flows when they need to be carried over a link whose admitted PCN rate already exceeds an admissible rate. Flow termination (FT) is a new flow control function that terminates some already admitted flows when they are carried over a link whose admitted PCN rate exceeds a supportable rate. The latter condition can occur in spite of AC, e.g., when traffic is rerouted due to network failures. This survey gives an introduction to PCN and is a primer for this new technology. It presents and discusses the multitude of architectural design options in an early stage of the standardization process in a comprehensive and streamlined way before only a subset of them is standardized by the IETF. It brings PCN from the IETF to the research community and serves as historical record.
    Original languageUndefined
    Pages (from-to)357-375
    Number of pages19
    JournalIEEE communications surveys & tutorials
    Issue number3
    Publication statusPublished - 2010


    • CR-C.2
    • flow termination
    • token bucket
    • congestion notification
    • IR-75369
    • admission control
    • Quality of Service
    • METIS-277478
    • EWI-19197

    Cite this