Safety message data transmission model and congestion control scheme in VANET

In order to ensure the safety in message data transmission and promote the effectiveness of congestion control, in this paper, we propose a novel congestion control mechanism based on adjusting beacon frequency and vehicle communication model. Based on the control theory and the features of VANET, an active safety information congestion structure is put forward at first. Then CACP algorithm is adopted to estimate the link bandwidth for congestion prediction. For periodic status messages and security messages a channel assignment algorithm is also proposed to ensure there is enough channel resource to transfer emergence messages. As a consequence of this, the status message accusers can be increased, which will avoid network congestion and improve the channel utilisation. From the simulation results, it can be observed that the proposed algorithm can effectively and accurately detect link load degree, improve throughput, decrease delay, reduce networked energy consumption and guarantee data fidelity. © 2019 Inderscience Enterprises Ltd.