Network slicing and efficient ONU migration for reliable communications in converged vehicular and fixed access network

Rapidly increased bandwidth of vehicle communication brings challenges on its infrastructure, especially for V2R/V2I scenarios. On the other hand, the costs and energy consumption asks for the network convergence among fixed access, roadside assistant vehicle network and even mobile networks. Therefore, flow interaction in the converged network threatens the reliability and safety of vehicle services. This paper proposes a flexible vehicle and fixed access converged network architecture and elastic slice-enabling scheme, to provide reliable vehicle communication service from the infrastructure level. In this architecture, optical network units (ONUs) are capable to be migrated flexibly between different optical line terminals (OLTs) to improve the bandwidth utilization of idle OLTs. Meanwhile, while taking into account the impact on network quality-ONU switching times and transmission distance, a flexible ONU migration algorithm (OMA) is proposed to maximize bandwidth resource utilization. The cross-region demonstration proves the feasibility of the proposed slicing mechanism, and the simulation results indicates that the bandwidth utilization ratio increases by 15% in the simulations circumstances.