Using Fuzzy Specifications to Manage QoS

This paper describes the use of fuzzy QoS specifications to manage quality of service. These specifications associate their membership functions with QoS levels perceived from a resource. Besides it is described the implementation of a QoS manager of fuzzy specifications. The QoS manager, denominated Mediator, has two parameters called α-cuts. One of them is used to allocate and the other to policy QoS requests. In short, these values determine thresholds for the QoS levels of the requests. These thresholds must be respected when the allocation and policy procedures are executed. Also, by applying the extension principle of fuzzy sets, Mediator accepts fuzzy specifications composed by two other specifications. Mediator is built as a CORBA application. Its primary purpose is to manage TCP traffic flow on IETF Differentiated Services Platforms.