IEEE 802.11p

IEEE 802.11p is a draft amendment to the IEEE 802.11 standard to add wireless access in the vehicular environment (WAVE). It defines enhancements to 802.11 required to support Intelligent Transportation Systems (ITS) applications. This includes data exchange between high-speed vehicles and between the vehicles and the roadside infrastructure in the licensed ITS band of 5.9 GHz (5.85-5.925 GHz). IEEE 1609 is a higher layer standard on which IEEE 802.11p is based. [cite web | url=http://www.standards.its.dot.gov/fact_sheet.asp?f=80 | title=IEEE 1609 - Family of Standards for Wireless Access in Vehicular Environments (WAVE) | publisher=U.S. Department of Transportation | date=January 9 2006 | accessdate=2007-07-15]

802.11p will be used as the groundwork for Dedicated Short Range Communications (DSRC), a U.S. Department of Transportation project based on the European Communications, Air-interface, Long and Medium range (CALM) system looking at vehicle-based communication networks, particularly for applications such as toll collection, vehicle safety services, and commerce transactions via cars. The ultimate vision is a nationwide network that enables communications between vehicles and roadside access points or other vehicles. This work builds on its predecessor ASTM E2213-03. [cite web | url=http://www.astm.org/cgi-bin/SoftCart.exe/DATABASE.CART/REDLINE_PAGES/E2213.htm?L+mystore+erug6226 | title=E2213-03 Standard Specification for Telecommunications and Information Exchange Between Roadside and Vehicle Systems | publisher=ASTM International | accessdate=2007-07-15]

Status

The 802.11p Task Group is still active. Per the official IEEE 802.11 Work Plan predictions the approved 802.11p amendment is scheduled to be published in April 2009. [cite web | url=http://grouper.ieee.org/groups/802/11/Reports/802.11_Timelines.htm | title=OFFICIAL IEEE 802.11 WORKING GROUP PROJECT TIMELINES | publisher=IEEE | accessdate=2007-07-15]

Most recently the European Commission has allocated 5.9Ghz band for priority road safety applications and inter-vehicle, infrastructure communications [cite web | url=http://europa.eu/rapid/pressReleasesAction.do?reference=IP/08/1240&format=HTML&aged=0&language=EN&guiLanguage=en | title=Cars that talk: Commission earmarks single radio frequency for road safety and traffic management | publisher=European Commission | date=2008-08-05 | accessdate=2008-08-23] . The intention is that compatibility with the USA will be ensured even if the allocation is not exactly the same; frequencies will be sufficiently close to enable the use of the same antenna and radio transmitter/receiver.

References

External links

* [http://grouper.ieee.org/groups/802/11/Reports/tgp_update.htm Status of the project 802.11p] IEEE Task Group TGp
* [http://www.unwired.ee.ucla.edu/dsrc/dsrc_testbed_simple.htm What is DSRC/WAVE?] UCLA article about their testbed
* [http://www.dailywireless.org/2004/07/15/intelligent-transportation-gets-80211p/ Intelligent Transportation gets 802.11p] "Daily Wireless" July 15, 2004
* [http://www.wi-fiplanet.com/columns/article.php/3422251 When Wi-Fi Will Drive] Adam Stone "Wi-Fi Planet"
* [http://www.vehicularlab.org UCLA on campus vehicular testbed]