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Erschienen in:
2012 | OriginalPaper | Buchkapitel
The Price of Evolution in Incremental Network Design (The Case of Ring Networks)
verfasst von : Saeideh Bakhshi, Constantine Dovrolis
Erschienen in: Bio-Inspired Models of Networks, Information, and Computing Systems
Verlag: Springer Berlin Heidelberg
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As it also happens in nature, technological networks typically evolve in an incremental manner, instead of being optimally designed. This evolutionary process is driven by changes in the underlying parameters and constraints (the “environment”) and it typically aims to minimize the modification cost after each change in the environment. In this paper, we first formulate the incremental network design approach and compare that with the more traditional optimized design approach in which the objective is to minimize the total network cost. We evaluate the cost overhead and evolvability of incremental design under two network expansion models (random and gradual), focusing on the simpler case of “ring” networks. We find that even though incremental design has some cost overhead, that overhead does not increase as the network grows. Also, it is less costly to evolve an existing network than to design it from scratch as long as the network expansion factor is less than a critical value.