A cross layer optimization scheme for WDM PON network design and dimensioning
We propose a novel cross layer optimization scheme for the design and dimensioning of greenfield WDM PON networks. For a given geographical location of the OLT, the ONUs and their corresponding aggregated traffic demand, we propose a generic integer linear programming (ILP) model which optimally and simultaneously: (i) congregates the ONUs into clusters, (ii) determines the type (splitter/ AWG) and number of output ports of the passive switching equipment for all clusters so that all ONUs can be served, (iii) identifies the location of the switching equipment, (iv) determines the proper link dimensioning so as to allow the provisioning of the overall aggregated traffic demand destined to/from the ONUs. The ILP model not only includes the physical layer constraints of PON (i.e., power attenuation and splitting ratio), but the optical layer constraints as well (i.e., number wavelengths carried by the optical fibers depending on the traffic and on the selected switching equipment). The resulting model is therefore the most general model proposed so far, and it guarantees the optimal solution in terms of minimum deployment cost for greenfield WDM PON, with a two stage architecture. Computational results demonstrate the validation and effectiveness of the proposed solution scheme on various data sets with up to 128 ONUs.