A novel task allocation for maximizing reliability considering fault-tolerant in VANET real time systems

Vehicular Ad-hoc Networks(VANET) has been considered as an important and popular research domain in future Intelligent Transportation Systems(ITS). To support VANET applications, some emerging technologies, such as cloud computing, fog computing, Software Define Network(SDN) are introduced in VANET. Although supported by these technologies, VANET still suffers with some problems, especially reliability issue. Due to the potentially processing nodes(communication links) failure in realistic environment, VANET safety applications, which have strict real time requirement, may fail and cause catastrophic consequence. In this paper, we propose a novel reliability model with delay constraint and fault-tolerant mechanism based on retransmission in hybrid SDN/Fog computing VANET(HSFV) architecture. With the global knowledge of SDN and low delay of fog computing, a novel fault-tolerant reliability optimization particle swarm optimization(FPSO-RO) algorithm is introduced into HSFV architecture. The simulation results indicate that the proposed algorithm could effectively evaluate and improve reliability in real-time VANET systems.