Deterministic and probabilistic QoS guarantees for the EF class in a DiffServ/MPLS domain

Leila Azouz Saidane , Pascale Minet (1) , Steven Martin , Ines Korbi

1 HIPERCOM - High performance communication

In the Differentiated Services (DiffServ) architecture, the Expedited Forwarding EF class has been proposed for applications requiring low end-to-end packet delay, low delay jitter and low packet loss (e.g. voice and video applications that are delay and jitter sensitive). In this paper, we focus on the quantitative Quality of Service (QoS) guarantee that can be granted to an EF flow in terms of end-to-end delay. Two approaches are presented. The deterministic one is based on a worst case analysis and leads to a deterministic bound which is infrequently reached. The probabilistic approach, based on the probability density function of the response time, is introduced to evaluate the probability of missing a given deadline. This study shows that delays much smaller than the deterministic bound can be guaranteed with probabilities close to one. An admission control derived from these results is then proposed, providing a probabilistic QoS guarantee to EF flows.

Mots clés: QUALITY OF SERVICE; PROBABILISTIC GUARANTEE; DETERMINISTIC GUARANTEE; END-TO-END RESPONSE TIME; M/G/1 STATION; MPLS/DIFFSERV

Domaines: Autre [cs.OH]

Leila Azouz Saidane, Pascale Minet, Steven Martin, Ines Korbi. Deterministic and probabilistic QoS guarantees for the EF class in a DiffServ/MPLS domain. [Research Report] RR-5622, INRIA. 2005, pp.24. ⟨inria-00070386⟩