End-to-End Delay Differentiation of IP Traffic Aggregates using Priority Queuing Models

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.

Proc of the 2002 Workshop on High Performance Switching and Routing (HPSR2002), IEEE Comm Soc, ATM Forum, IEICE Comm Soc, Kobe, Japan, May 26-28, 2002