Tuning Delay Differentiation in IP Networks using Priority Queueing 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 Queueing models to achieve delay differentiation in IP networks operating under the Class of Services paradigm. Three models are considered: proportional model, additive model and a novel hybrid schema based on the upper time limit model. The characteristics, behaviour and viability of these models are analysed as regards traffic delay differentiation. The impact of each model on traffic aggregation and on individual flows is also evaluated. This study is complemented by the analysis of delay differentiation from an end-to-end perspective. An adaptive differentiation mechanism is also proposed and discussed.

Lecture Notes in Computer Science, vol 2345, pp. 709-720, Springer-Verlag, 2002
Second International IFIP-TC6 Networking Conference, Pisa, Italy, May 19-24, 2002