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Using a Hop-Constrained Model to Generate Alternative Communication Network Design

Designing the link topology and selecting capacities in a backbone network of a communication system involve complex tradeoffs between investment and operating costs and service considerations such as network reliability and vulnerability, delays, and blocking. Incorporating all these design criteria simultaneously in a comprehensive model results in a large-scale, nonlinear, discrete optimization problem that is intractable. This paper proposes an alternate optimization-based methodology to generate several cost-effective backbone network designs with varying cost and performance characteristics. Network planners can use this method together with detailed performance evaluation techniques to select a design that achieves the proper balance between conflicting objectives. To generate different configurations, the method parametrically varies a set of hop constraints that restrict the number of links over which messages can be transmitted. Reducing the maximum number of hops increases the number of alterna...