Considerations about service differentiation using a combined QoS/QoR approach

The paper proposes a novel approach to service differentiation using both ´classical´ QoS parameters and novel resilience-oriented QoR (quality of resilience) parameters. In this concept, two network states are defined, ´fully operational´ and ´after failure´, enabling the operators to define precisely the QoS guarantees before and after a failure occurrence, and to distribute information about failure severity to a customer/user. As such, a combined QoS/QoR approach can be seen as a kind of an ´insurance´ for the customer, i.e. sharing the risk of a failure occurrence and enabling selective treatment of individual services. In the ´after failure´ state, the failure is unverifiable for the user, and a service with a lower QoS guarantee is provided at possibly reduced costs.