A Hybrid Wavelength Allocation Framework for Fiber-Wireless Based Vehicle-to-Infrastructure Communication Network

In order to facilitate low latency vehicle-to-infrastructure (V2I) communication, latency sensitive solutions for resource allocation should be explored. In our paper, we propose a novel wavelength allocation algorithm for a fiber-wireless (FiWi) based V2I communication network. Specifically, we propose a novel approach for wavelength allocation in a time and wavelength division multiplexed passive optical network (TWDM-PON) by utilizing a first-fit bin packing algorithm. The TWDN-PON forms the optical backhaul of our FiWi network. The proposed algorithm is hybrid in nature, i.e., it utilizes both static and dynamic wavelength allocation. Further, the proposed algorithm enables an hourly allocation of wavelength to each optical network unit (ONU), connected to a roadside unit (RSU), whilst reducing the switching between the wavelengths and hence, consequently reducing the latency in the optical link. The proposed bin packing algorithm has been compared with conventional first-fit bin packing algorithm. It has been shown that by utilizing the proposed algorithm, the total number of wavelength switches reduces by 65 in 12 hours duration as well as the latency of the optical network reduces by 40% per ONU when compared with the conventional bin packing algorithm.