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Unicast and multicast QoS routing with soft constraint logic programming

By Stefano Bistarelli, Ugo Montanari, Francesca Rossi and Francesco Santini


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 th

Topics: Categories and Subject Descriptors, D.3.2 [Programming Languages, Language Classifications—Constraint and logic languages, D.3.3 [Programming Languages, Language Constructs and Features—Constraints, C.2.3 [Computer-Communication Networks, Network Operations—Network management, F.4.1 [Mathematical Logic And Formal Languages, Mathematical Logic—Logic and constraint programming General Terms, Languages, Measurement, Theory
Year: 2008
OAI identifier: oai:CiteSeerX.psu:
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