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Proposed Charter (1) The PCN WG will tackle the problem of how to provide scalable, resilient admission control and strong QoS assurance while using packet marking techniques. Current attempts to deliver QoS using only packet marking (e.g. DiffServ) are limited in the level of QoS assurance that can be provided without substantial over-provisioning. To improve the QoS assurance, PCN will add flow admission control and flow pre-emption. In normal circumstances admission control should protect the QoS of previously admitted flows. In times of heavy congestion (for example caused by route changes due to link or router failure) pre-emption of some flows should preserve the QoS of remaining flows. While the WG will address both admission and pre-emption, it is assumed that these mechanisms can be used independently of each other, and the use of one does not mandate the use of the other. |