Optimizing Congestion Control for Non Safety Messages in VANETs Using Taguchi Method

Abstract

VANETs are the next uprising technology in automotive industry to promote safety and valuable information to make a better driving experience. This technology allows vehicle to communicate directly to the next vehicle and exchange data. The main purpose of VANETs is to improve traffic safety and to provide efficient traffic management on road via safety and non-safety message. Safety and non-safety messages are disseminated instantly among the vehicles through broadcasting protocol. By broadcasting, message can be delivered to multiple vehicles at the same time within vicinity. When too many vehicles broadcasting in dense traffic, VANETs suffer network congestion due to excessive amount of broadcast messages consume the bandwidth of communication channel. When broadcast storm occurs, message could not be delivered properly due to packet loss in the transmission. To address this issue, congestion control mechanism was proposed to alleviate the congestion in the communication channel during broadcast storm. In this research, the congestion control is applied to Service Channel communication (SCH) for non-safety message. The proposed congestion control was also tested using Taguchi method to optimize packet loss reduction in the network. The experiment was conducted with and without Taguchi method in urban area. The obtained results from the experiment show packet loss was greatly reduced when applying congestion control with Taguchi method. The results have proven that integrating Taguchi method in congestion control mechanism could improve packet loss reduction when broadcast storm take place in high-density traffic.