Adaptive Message Rate Control of Infrastructured DSRC Vehicle Networks for Coexisting Road Safety and Non-Safety Applications

Wenyang Guan,Jianhua He,Chao Ma,Yue Li,Zuoyin Tang

doi:10.1155/2012/134238

Wenyang Guan, Jianhua He + Show 3 more

Open Access

https://doi.org/10.1155/2012/134238

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Abstract

Intelligent transport system (ITS) has large potentials on road safety applications as well as nonsafety applications. One of the big challenges for ITS is on the reliable and cost-effective vehicle communications due to the large quantity of vehicles, high mobility, and bursty traffic from the safety and non-safety applications. In this paper, we investigate the use of dedicated short-range communications (DSRC) for coexisting safety and non-safety applications over infrastructured vehicle networks. The main objective of this work is to improve the scalability of communications for vehicles networks, ensure QoS for safety applications, and leave as much as possible bandwidth for non-safety applications. A two-level adaptive control scheme is proposed to find appropriate message rate and control channel interval for safety applications. Simulation results demonstrated that this adaptive method outperforms the fixed control method under varying number of vehicles.

Highlights

Intelligent transport system (ITS) has received wide interests since the last decade due to its huge potentials on traffic safety applications, business logistics, route planning, entertainment, and many other applications
It can be seen that the combination of Best effort (BE), rate, and control channel (CCH) interval length selected by the offline procedure performs well in QoS provisioning, that is, event-driven safety applications (ESA) messages delay is lower than 20 ms, message success probability for both ESA and periodic safety applications (PSA) is over than 90% as required
We investigated a system control issue faced by the coexisting safety and non-safety application deployed over dedicated shortrange communications (DSRC) vehicle networks

Summary

Introduction

Intelligent transport system (ITS) has received wide interests since the last decade due to its huge potentials on traffic safety applications, business logistics, route planning, entertainment, and many other applications. We consider two major types of safety applications: event-driven safety applications (ESA) and periodic safety applications (PSA) Their QoS can be differentiated by channel access schemes and message rate control schemes. With the challenges on the development of coexisting safety and non-safety applications over DSRC-based vehicle networks, it is important to improve the utilization of the limited spectrum resources for DSRC networks, while meeting the QoS requirements for the road safety applications. We propose an adaptive control scheme to avoid network congestion and provide good QoS for safety applications. To facilitate the adaptive control of the DSRC networks, we use an off-line simulation based approach to find out the best possible configurations of CCH interval, safety message rate, and channel access parameters for given combinations of safety QoS requirements and the number of vehicles.

Background

Adaptive Control Scheme

Numerical Result

Findings

Conclusion