This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
“Wireless Communications for Vehicle Safety:Radio Link Performance & Wireless Connectivity Methods”
Technical Paper
2006-21-0030
Annotation ability available
Sector:
Event:
Convergence 2006
Language:
English
Abstract
Many accidents occur today when distant objects or roadway impediments are not quickly detected. To help avoid these accidents, longer-range safety systems are needed with real-time detection capability and without requiring a line-of-sight (LOS) view by the driver or sensor. Early detection at intersections is required for obstacle location around blind corners and dynamic awareness of approaching vehicles on intersecting roadways.
Many of today's vehicular safety systems require short LOS distances to be effective. Such systems include forward collision warning, adaptive cruise control, and lane keeping assistance. To operate over longer LOS distances and in Non-LOS (NLOS) conditions, cooperative wireless communications systems are being considered. This paper describes field results for LOS and NLOS radio links for one candidate wireless system: 5.9GHz Dedicated Short Range Communications (DSRC).
In implementing vehicle safety systems with multiple channels and using vehicles with a single transceiver, consideration must be given to how a group of vehicles in a localized area becomes aware in real-time of potentially dangerous situations. Given that wireless vehicle safety systems may use multiple links, channels, and message priorities, one might ask how these resources could be used in an organized fashion to optimize the efficiency of a wireless system. This paper discusses a method called Multi-channel Management, which enables vehicles to use DSRC resources to synchronize with each other, receive high-priority safety messages with low transmission latency, accommodate any range of safety message traffic, and participate in non-safety services by sharing capacity on other channels. Given that the DSRC system requires that safety-of-life messages have the highest priority, the described method essentially achieves “continuous wireless connectivity” for high-priority safety messages transmitted and received within a localized group of vehicles.
With prolific worldwide growth in the use of wireless local area network (WLAN) adapters to obtain broadband Internet access at WLAN hotspots, automotive OEMs are considering in-vehicle WLAN radio installation. Further, the wireless industry is investigating how handoffs between WLAN and cellular networks could provide connectivity to vehicles when they are out-of-range of hotspots. With this motivation, this paper discusses an approach for providing continuous vehicular links to the Internet using cellular-WLAN roaming.
Recommended Content
Authors
Topic
Citation
Gallagher, B., Akatsuka, H., and Suzuki, H., "“Wireless Communications for Vehicle Safety:Radio Link Performance & Wireless Connectivity Methods”," SAE Technical Paper 2006-21-0030, 2006.Also In
References
- Bishop, Richard “Intelligent Vehicle Technology and Trends” Artech House 2005
- Biswas et.al. “Vehicle-to-Vehicle Wireless Communication Protocols for Enhancing Highway Traffic Safety” IEEE Communications Magazine January 2006
- “Standard Specification for Telecommunications and Information Exchange Between Roadside and Vehicle Systems - 5 GHz Band Dedicated Short Range Communications (DSRC) Medium Access Control (MAC) and Physical Layer (PHY) Specifications,” ASTM Int'l. July 2003
- Patrich, L. “FCC Adopts Rules for Intelligent Transportation Systems to Advance Homeland Security and Traveler Safety,” FCC News Media Information, FCC Washington, D.C. Dec. 17 2003
- “Draft Amendment to Standard for Information Technology - Telecommunications and information exchange between systems - Local and Metropolitan networks - specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Amendment 3: Wireless Access in Vehicular Environments (WAVE),” IEEE February 2003
- Vehicle Safety Communications Project, Task 3 Final Report U.S. Department of Transportation March
- Jones, Bill “ Vehicle Infrastructure Integration ” US DOT, ITS Joint Program Office,
- A Collaboration of Metropolitan Transportation Commission (MTC), Caltrans, DaimlerChrysler and Volkswagen/Audi “ VII California Concept of Operations ” July 21 2005
- Misener, Jim “ Technology Trends for Automotive Safety ” 18 20 March 7 2005
- Gallagher, B. “Field Tests of 802.11-Based Ad Hoc Wireless Links To High Speed Vehicles,” ITS World Congress Nagoya, Japan October 2004
- Hunzinger, J. “ i-Channel Specification ,” July 25 2005
- IEEE “Draft Amendment to STANDARD [for] Information Technology Telecommunications and Information Exchange Between Systems - LAN/MAN Specific Requirements - Part 11: Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Medium Access Control (MAC) Quality of Service (QoS) Enhancements IEEE November 2003
- Rasin, V. et.al. “ The New Wireless Frontier: Home and Vehicle Connectivity” IEEE VTS News November 2005
- Kazuoki Matsugatani DENSO CORPORATION “Seamless Roaming in the Micro-Mobility Environment” ITS World Congress Nagoya, Japan October 2004