Packet Loss Measurement and Control for VPN based Services

Provisioning QoS enabled VPN services over packet switched networks is increasingly important for service providers. Prior works usually adopted the proactive service admission approach, but little attention has been given to the control of QoS parameters after the service has been instantiated. This paper proposes a packet loss measurement and rate-based feedback control system that maintains preset packet loss targets for instantiated VPN services in the provider´s backbone network. Specifically, the system utilizes the measurement and estimation of packet loss probability as the feedback signal, and then applies a pole placement technology to design the controller for throttling ingress customers´ traffic. Through a number of experiments, the transient and steady state performance of the controller is evaluated. The numeric results show that, under appropriately selected control gains, it is possible to maintain the network operation within a prescribed loss range