Anna Urra

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In this paper a new methodology to evaluate the protection performance of some existing mechanisms for establishing quality of service network paths with protection is presented. In order to evaluate the protection degree of a network, different components, such as protection parameters (packet loss and restoration time), or network parameters and(More)
IP based networks still do not have the required degree of reliability required by new multimedia services, achieving such reliability will be crucial in the success or failure of the new Internet generation. Most of existing schemes for QoS routing do not take into consideration parameters concerning the quality of the protection, such as packet loss or(More)
We define new quality-of-service (QoS) routing schemes with protection in In-ternet Protocol (IP)/Multiprotocol Label Switching (MPLS) over optical networks. The novelty of the proposed routing schemes is the use of the knowledge of the logical links already protected by the optical layer. The logical topology defined by the optical layer is given and(More)
— In this paper a novel methodology aimed at minimizing the probability of network failure and the failure impact (in terms of QoS degradation) while optimizing the resource consumption is introduced. A detailed study of MPLS recovery techniques and their GMPLS extensions are also presented. In this scenario, some features for reducing the failure impact(More)
— This paper focuses on QoS routing with protection in an MPLS network over an optical layer. In this multi-layer scenario each layer deploys its own fault management methods. A partially protected optical layer is proposed and the rest of the network is protected at the MPLS layer. New protection schemes that avoid protection duplications are proposed.(More)
This paper presents a tool, for the analysis and regeneration of web contents, implemented through XML and Java. At the moment, the web content delivery from server to clients is carried out without taking into account clients' characteristics. Heterogeneous and diverse characteristics, such as user's preferences, different capacities of the client's(More)
Minimum interference routing schemes are good options for achieving fewer working-path request rejections. They improve the vast majority of the current QoS routing proposals. However, when backup paths are added there is no guarantee of achieving a similar performance. In this paper, we analyze the suitability of these routing schemes in protected network(More)
In this paper we present an implementation using XML and Java (X-SHAAD) based on a modular architecture of SHAAD to support a web-based Adaptive Hypermedia System. This architecture considers the hypermedia adaptation along three different " adaptivity dimensions " : user characteristics, technology (the network and the user's terminal), and user(More)
In this paper, we define a new scheme to develop and evaluate protection strategies for building reliable GMPLS networks. This is based on what we have called the Network Protection Degree (NPD). The NPD consists of an a priori evaluation, the Failure Sensibility Degree (FSD), which provides the failure probability, and an a posteriori evaluation, the(More)
The next generation backbone networks, optical IP/MPLS networks, enable increasingly higher volumes of information to be transported. In this network architecture, a fiber failure can result in a loss of several terabits of data per second and leads to multiple failures in the upper network layer. Thus, the ability of the network to maintain an acceptable(More)