A Data Dissemination System towards Improving Channel Efficiency

Abstract

Recent advancement of wireless communication technology in vehicular ad-hoc networks(VANETs) is expected to make various driving-related applications, which are envisioned by people, come true in near future. Data dissemination plays an important role to enable the emerging applications. Nevertheless, due to the limited bandwidth resource and the dynamic traffic feature, it is challenging to provide efficient data services in VANETs. In this work, we present a data dissemination system based on a hybrid of infrastructure-to-vehicle (I2V) and vehicle-to-vehicle(V2V) communications and a cooperation among multiple roadside units (RSUs) on a two-way roadway. The primary objective is to best explore the channel efficiency for both I2V and V2V communications and offload workloads of RSUs so that the system performance on data service can be maximized. To this end, we propose and integrate three approaches to enhance channel utilization and offload the workloads of RSUs. Specifically, in RSU’s coverage, data items are disseminated via the hybrid of I2V and V2V communications. For the vehicles travelling out of the RSU’s coverage, certain vehicles will be designated by RSUs to provide data services via V2V communication, which are called server-vehicles. Finally, RSUs located at different spots are designed to cooperate with each other for I2V data dissemination and a server-vehicle designation. An extensive performance evaluation demonstrates that the algorithm which combines the above three approaches can achieve higher service ratio, lower service delay, and higher fairness compared with the most competitive solution in the literature. ⓒ 2016 DGIST