Different Traffic Quality Aggregations for a Service Composition

The present paper studies the problem of the composition of traffic quality in a service composition. The causal structure is represented through causal virtual devices corresponding to parasitic, carried and served traffic. Causal composition and decomposition of traffic quality is represented graphically and analytically. A naming system of the virtual devices is proposed which takes into account the level of inclusion of the base virtual devices into the comprised. Different traffic quality aggregations are derived for service compositions in the cases of consecutively and parallel connected virtual devices.