Bidirected and unidirected capacity installation in telecommunication networks Original Research Article

In the design of telecommunication networks, decisions concerning capacity installation and routing of commodities have to be taken simultaneously. Network Loading problems formalize these decisions in mathematical optimization models. Several variants of the problem exist: bifurcated or non-bifurcated routing, bidirected or unidirected capacity installation, and symmetric versus non-symmetric routing restrictions. Moreover, different concepts of reliability can be considered. In this paper, we study the polyhedral structure of two basic problems for non-bifurcated routing: network loading with bidirected and unidirected capacity installation.