An Adaptive Link Quality-Based Safety Message Dissemination Scheme for Urban VANETs

摘要

In urban vehicular ad hoc networks (VANETs), signal propagation experiences severe attenuation from obstacles especially at intersections. Multi-hop broadcast schemes are often used to disseminate safety messages to region of interest. However, existing multi-hop broadcast schemes either neglected the impact of realistic physical channels or just considered part of it. In this letter, we propose a link quality-based safety message dissemination scheme for urban VANETs. A comprehensive physical channel connectivity calculation method is proposed for accurately estimating the connectivity probability among vehicles. A score-based priority allocation mechanism for candidate forwarders (CFs) is proposed to coordinate the contention among CFs. Finally, we calculate the minimum waiting time and contention window size for each vehicle in CFs. Simulation results show that our proposed scheme outperforms existing multi-hop broadcast schemes for urban VANETs.