Pedro Sousa, Paulo Carvalho and Vasco Freitas
Universidade do Minho
Departamento de Informática
P-4710-057 Braga, Portugal
Tel.: +351 253 604470
Fax.: +351 253 604471
E-mail: {pns,paulo,vf} (at) uminho.pt
This article evaluates the use of Priority Queuing (PQ) Models to achieve delay differentiation in networks operating under the Class of Services paradigm. Three PQ variants are considered: the proportional model, the additive model and a novel hybrid schema based on the upper time limit model. Through appropriate queueing and scheduling, delay differentiation is first considered for a node, and then extended to an end-to-end perspective. For each model, the corresponding delay differentiation bounds are determined and verified resorting to simulation.