An optimization algorithm for downstream wavelength selection and scheduling in WDM PON-based mobile backhaul networks

In this paper, a new optimization algorithm is proposed for downstream wavelength selection and scheduling (WSaS) for WDM PON-based mobile backhaul networks. The main objective of this Integer Linear Program (ILP) formulation is to improve the time delay of the packet delivery from the infrastructure to the end-users (mobile or fixed users). This is achieved through dynamic selection and scheduling of different wavelengths in a ring-based WDM-PON architecture that is utilized to backhaul mobile traffic. Heuristic algorithms implementing WSaS are also developed and compared with the ILP in terms of the packet delay for varying traffic loads.