Iradj Ouveysi

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We investigate network planning and design under volatile conditions of link failures and trac overload. Our model is a non-simultaneous multi-commodity problem, with any particular two link failure being considered as one scenario. We show that the optimal solution model is not practically solvable for real-world problems and hence an ecient heuristic is(More)
This paper proposes a new measure for network performance evaluation called topology lifetime. The measure provides insight into which one of a set of topologies is likely to last the longest before more capacity must be installed. The lifetime measure is not single valued, but considers growth as a function of a set of demand shifts (perturbation). One(More)
Introducing a new concept of (α, β)-fairness, which allows for a bounded fairness compromise, so that a source is allocated a rate neither less than 0 ≤ α ≤ 1, nor more than β ≥ 1, times its fair share, this paper provides a framework to optimize efficiency (utilization, throughput or revenue) subject to fairness constraints in a general telecommunications(More)
In this paper we propose the use of optimization based clustering algorithms to determine hierarchical multicast trees. This problem is formulated as an optimization problem with a non-smooth, non-convex objective function. Different algorithms are examined for solving this problem. Results of numerical experiments using some artificial and real-world(More)
The level of traac and the distribution of traac tend to vary in a telecommunications network. Obtaining a minimum-cost network for multi-hour traac proole is a large-scale optimization problem. We formulate this as a linear programming problem and use this as a basis for comparing the eecacy of the heuristics we introduce. Our heuristic is to view this as(More)
Introducing the concept of α-fairness, which allows for a bounded fairness compromise, so that no source is allocated less than a fraction α of its fair share, this letter studies tradeoffs between efficiency (utilization, throughput or revenue) and fairness in a general telecommunications network with relation to any fairness criterion. We formulate a(More)
Optical burst switches (OBSes) have been proposed to improve the utilization of a network of optical cross connect (OXCs). Current studies on OBS assume a network consisting of OBSes alone. While this is a reasonable assumption for evaluating a new technology, the question of how a network of OXCs can be evolved to a network of OBSes has not been studied.(More)
This paper explores the potential benefits of programmable networks for telecommunication carriers. It particularly focuses on using a programmable network to offer a new type of wholesale product by adding value to the wholesale of pure carriage. By augmenting the wholesale of carriage with the wholesale of network-based computation, the need for server(More)