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Lower bounding techniques for frequency assignment. (English) Zbl 0956.90057
Summary: The frequency assignment problem is an NP complete problem of great importance to the radiocommunications industry. Most current solution techniques for real frequency assignment problems use heuristic algorithms to obtain suboptimal solutions in an acceptable time. By formulating the problems in terms of graph colourings, lower bounds can be obtained to assess the quality of these heuristic solutions.
Bounds based on the travelling salesman problem have proved to be successful, in some cases giving tight bounds when applied to a suitable subproblem. However, for general problems these bounds may be difficult to calcualte or are far from optimal. The choice of subproblem is critical in evaluating these bounds and can also be of use in the application of the heuristic algorithms. In this paper we present a number of new and improved techniques for determining lower bounds.

MSC:
90C35 Programming involving graphs or networks
05C90 Applications of graph theory
90C27 Combinatorial optimization
Software:
FASoft
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