Slotted TDMA Multichannel MAC for Overlapped Vehicular Networks with SDN-based Distributed System

The IEEE 802.11p, IEEE 1609, and wireless access in vehicular environment (WAVE) standards are developed to be used on multi-channels in dedicated short range communication (DSRC) spectrum. While the vehicular networks will be inevitably installed in overlapped manner in metropolitan area, most research works of VANETs, however, are focused on the coordinated multichannel MAC protocol operations in a single isolated ad hoc network environment without considering overlapped vehicular network environments that include interferences from neighbor networks. In this paper, we propose a slotted TDMA Multichannel MAC (STMC-MAC) for overlapped vehicular networks (OVN) with software-defined networking-based distribution system (SDN-DS) as infrastructure. The proposed STMC-MAC guarantees reliable delivery of basic safety message (BSM) with bounded delay and scalability on OVN with SDN-DS for metropolitan area with high vehicular density. The proposed STMC-MAC provides higher scalability, reliability, and flexibility in BSM and non-BSM data exchanges at various VN-ESS topologies and different level of vehicular density. The proposed scheme had been implemented on NS-3 network simulator, and the performances of the proposed scheme are measured, analyzed, and compared with existing approaches.1