VIMAC: Vehicular information medium access control protocol for high reliable and low latency transmissions for vehicular ad hoc networks in smart city

The vehicular ad hoc network (VANET) is a promising solution for intelligent transport system in the future smart city. Time division multiple access (TDMA) based VANETs can enhance road safety level through providing safety related applications which pose stringent latency and reliable requirements. In this paper, we provide the mathematical expression to clarify the object of low latency and high reliable communications in TDMA-based VANETs. It can be seen from the object, the transmission collision problem is the biggest obstacle currently. Then, a novel MAC protocol is proposed to overcome the obstacle. The proposed scheme, which is called vehicular information medium access control (VIMAC) utilizes vehicular information, and involves the concepts of multi-hop relaying and temporal central nodes. We develop an analytical model to evaluate performances of the proposed scheme and the baseline protocols. The analytical model shows the advantages of our proposed scheme. At last, we use MATLAB and SUMO to construct a system level simulation platform, the simulation results are consistent with the analytical results. (C) 2020 Elsevier B.V. All rights reserved.