An Improved Congestion Control Strategy Based on TCP in Multi-Radio Multi-Channel VANET

Abstract

Vehicular Ad Hoc Network (VANET) has become an indispensable part of the Intelligent Transport System (ITS). Due to the mobility of the vehicular node, a serious challenge to the reliable transmission of video images and other high-bandwidth data traffic for automatic driving in VANET is presented. Multi-Radio Multi-Channel (MRMC) allows nodes to communicate on different channels simultaneously when the wireless channels are available for use, can greatly improving mobile communication stability, and provides more efficient network performance. The congestion control strategy in traditional TCP is unfit in the dynamic MRMC VANET environment under full duplex communication mode where the topology changes frequently. As a result, it is essential to draw up an optimal congestion control strategy appropriate for MRMC VANET. This paper presents a data packet accumulation model for expressing network congestion. then The MRMC VANET is endowed with a veracious physical model of particle diffusion and the optimal vehicular node data transfer rate is calculated utilizing the Fokker-Planck equation. After that an improved congestion control strategy based on TCP for MRMC VANET is proposed according to the above results. In the last part we demonstrate the superior performance of the proposed congestion control strategy in MRMC VANET through NS2 simulation.