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 al...
