A Unified Metric for Quality of Service Quantification
Pedro Alipio1, Solange Lima2
and Paulo Carvalho2
Critical Software, S.A.1
Parque Industrial de Taveiro
P-3045-504, Coimbra, Portugal
Universidade do Minho2
Departamento de Informática
P-4710-057 Braga, Portugal
Tel.: +351 253 604436; Fax.: +351 253 604471
E-mail: pmc at di.uminho.pt
Abstract
Internet service providers usually express the quality of network
services through a set of values determined according to several
network performance parameters periodically collected or measured.
However, for common end-users, these values do not give an overall idea
of the quality of the network services as they stand for different
units and evaluate different perspectives of each service quality.
In this context, this paper proposes the definition of a
service-oriented unified metric which quantifies a global Quality of
Service (QoS) indication by processing standard QoS parameters through
a fuzzy controller. The proposed methodology, based on fuzzy logic and
tested on Xfuzzy 3.0 platform, allows to close the gap between a
high-level QoS perspective and the effective QoS measurements at lower
protocolar levels. The definition of a single per-service QoS metric
can be useful to simplify control tasks such as QoS routing, SLA
negotiation and auditing.
SIMUTools/QoSim 2009,
Rome, Italy, March 2009