Partearroyo González, Rodrigo

ABSTRACT
Deployment of quality-of-service (QoS) policies is becoming one of the biggest challenges for today's Internet Service Providers (ISPs). Nowadays, QoS does not only address specific technical standard metrics; it must be concern about other aspects such as user's final perception or regulations mandatory compliments instead. Although some efforts are being made on studying and analysing this new QoS scope, there are not still many advances on defining methodologies to deploy it on real network sceneries. UIT-T Rec. G-1000 makes an approachon this issue and provides a meaningful framework to users, service providers and regulators. Nevertheless, UIT-T G.1000 does not go an step further and remains at the 'theorical stage'. Our research group NQaS (Networking Quality and Security) is carrying out different initiatives focus on solving this new QoS dimension. This paper presents some of the on-going research areas of NQaS on the way to find an appropiate methodology to apply a global QoS policy in an ISP on the basis of the UIT-T G.1000 framework.

ABSTRACT
Data network services have been developed since their begining and nowadays they are showing a great expansion. This is the case of the streaming services such as voice transmision over IP (VoIP). The technology is in an advanced state, however, the Quality of Service (QoS) measurement and evaluation are still being studied. This paper analyzes the relationship between the user's perceived quality and the impairment factors of the network, as well as, the methodology followed to measure the required parameters. The results are expected to be interesting not only for the users but also for the Internet providers, so that it gives them the oportunity to improve the service offered in an optimal way.

ABSTRACT
Data network Quality of Service (QoS) measurement and evaluation is a challenge being deeply studied nowadays. Measurement techniques and methodologies are broad available, but they are not connected among them, this is, the evaluation is based on raw parameters. In this paper we present a proposal of an integrating architecture which can evaluate user's perceived QoS, merging results obtained by different measurement tools in order to acquire a better knowledge of the communication link than using a single parameter. Extra effort is made to develop a set of easy to use and understand measurement tools.

ABSTRACT
Nowadays, two possible ways are possible to evaluate quality of service in data networks. On one hand, QoS has been traditionally quantified objectively across a group of technical measurable parameters. Nevertheless, the evaluation of QoS in data networks based on the perception that have the users of them, on the basis of parameters adapted at its level of knowledge, is gaining greater importance. Therefore, following this tendency, the “Observatorio de Medidas” raises an innovating architecture, that is able to fill the existing gap between the models of analyses of QoS based on strictly theoretical parameters and the ability to obtain useful data on the basis of a series of collected real data from measures made by means of different QoS evaluation tools in data networks.