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arXiv · 0704.1783

Unicast and Multicast Qos Routing with Soft Constraint Logic Programming

Stefano Bistarelli·Ugo Montanari·Francesca Rossi·Francesco Santini
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Abstract

We present a formal model to represent and solve the unicast/multicast routing problem in networks with Quality of Service (QoS) requirements. To attain this, first we translate the network adapting it to a weighted graph (unicast) or and-or graph (multicast), where the weight on a connector corresponds to the multidimensional cost of sending a packet on the related network link: each component of the weights vector represents a different QoS metric value (e.g. bandwidth, cost, delay, packet loss). The second step consists in writing this graph as a program in Soft Constraint Logic Programming (SCLP): the engine of this framework is then able to find the best paths/trees by optimizing their costs and solving the constraints imposed on them (e.g. delay < 40msec), thus finding a solution to QoS routing problems. Moreover, c-semiring structures are a convenient tool to model QoS metrics. At last, we provide an implementation of the framework over scale-free networks and we suggest how the performance can be improved.

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Stefano Bistarelli, Ugo Montanari, Francesca Rossi, Francesco Santini. 2008-04-21. Unicast and Multicast Qos Routing with Soft Constraint Logic Programming. https://arxiv.org/abs/0704.1783

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