Abstract
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.
I. INTRODUCTION
A large number of applications in vehicular ad hoc networks (VANETs) rely on vehicle-to-vehicle (V2V) communication. These applications range from safety to traffic management and entertainment [1]. Traditional V2V communication in VANETs works in the 5.9GHz band, which is known as the dedicated short-range (DSRC) frequency band. In this letter, we mainly focus on the safety message dissemination in DSRC frequency band.
V. CONCLUSION
In this letter, we proposed an adaptive link quality based safety message dissemination mechanism for urban VANETs. A comprehensive physical channel connectivity calculation method was built among vehicles. We proposed a score-based priority allocation mechanism and waiting time calculation mechanism for CFs. The simulation results demonstrate the superiority of our protocol.
