QoS-guaranteed DiffServ-aware-MPLS traffic engineering with controlled bandwidth borrowing

In this paper we propose an integrated traffic engineering mechanism based on the DiffServ-aware-MPLS for Next Generation Internet that provides guaranteed bandwidth with controlled bandwidth borrowing among LSPs. In the proposed scheme, each DiffServ class-type is managed with per-class-type queuing controlled by committed data rate (CDR), peak data rate (PDR) and related burst sizes. A hierarchical DiffServ packet scheduler controls the aggregated packet flow of multiple DiffServ class types, where a priority-based scheduler is used for overall traffic, and a weight-based scheduler is used for the AF traffic flows. Another packet scheduler for MPLS LSPs is also organized with hierarchical configuration of weight-based scheduling and priority-based scheduling. We also propose a controlled bandwidth borrowing mechanism with extended MPLS signaling for maximized resource utilization. From the simulation results, we could see the usefulness of the proposed scheme to guarantee QoS provisioning and maximize resource utilization.