IEEE 802.11p

IEEE 802.11p
Name	IEEE 802.11p
Title	IEEE 802.11p
Standard	IEEE Standards Association
Status	Published
Year	2010
Related	IEEE 802.11, IEEE 1609, ETSI ITS-G5, DSRC

IEEE 802.11p is an amendment to the IEEE 802.11 family developed to support wireless access in vehicular environments, enabling low-latency communication among vehicles and roadside infrastructure. It was published to complement regional initiatives and standards led by organizations such as the Institute of Electrical and Electronics Engineers, the European Telecommunications Standards Institute, and national programs in the United States Department of Transportation, providing a basis for projects involving the United States Federal Highway Administration, the European Commission, and automotive manufacturers like Toyota Motor Corporation, General Motors, and Volkswagen Group.

Overview

IEEE 802.11p defines modifications to the existing IEEE 802.11 physical and medium access control layers to adapt wireless LAN technology to high-speed vehicular scenarios. The amendment was developed in coordination with standards bodies including the IEEE Standards Association, ETSI, and consortia such as the Car 2 Car Communication Consortium and the 5G Automotive Association. It addresses use cases advocated by transportation agencies such as the Federal Highway Administration and research programs at institutions like the Massachusetts Institute of Technology, the University of California, Berkeley, and the Fraunhofer Society.

Technical Specifications

The specification operates in designated ITS frequency bands allocated by regulatory authorities such as the Federal Communications Commission and the European Conference of Postal and Telecommunications Administrations. It uses orthogonal frequency-division multiplexing derived from IEEE 802.11a with channel bandwidths commonly set to 10 MHz to improve delay spread resilience in vehicular channels, aligning with test profiles from entities like the National Institute of Standards and Technology and the ETSI TC ITS group. Key parameters reference modulation and coding schemes similar to those in standards adopted by companies including Intel Corporation, Qualcomm Incorporated, and Cisco Systems. The amendment defines timing, beaconing, and MAC enhancements harmonized with profiles specified by the IEEE 1609 family and regionally by ETSI ITS-G5.

Protocol Operation and Components

Operation relies on ad hoc vehicular networking concepts comparable to [work by] research centers such as Carnegie Mellon University, Stanford University, and University of Cambridge. Components include on-board units (OBUs) and roadside units (RSUs) produced by suppliers like Continental AG, Bosch, and NXP Semiconductors. The MAC layer enables carrier-sense multiple access with collision avoidance adapted for rapidly changing topologies discussed in studies at ETH Zurich and the University of Michigan. Interoperability is tested against profiles from industry alliances including the European Telecommunications Standards Institute and the Automotive Grade Linux project.

Security and Privacy

Security frameworks for deployments often follow the security services architecture defined in the IEEE 1609.2 standard and regional credential management models advocated by authorities such as the European Commission's Cooperative Intelligent Transport Systems programs and the United States Department of Transportation's Security Credential Management System pilots. Cryptographic practices involve digital certificates and pseudonym schemes influenced by initiatives at Microsoft Corporation, Google LLC, and research at EPFL and Technische Universität München. Privacy-preserving mechanisms are debated in forums including the Internet Engineering Task Force, the 3rd Generation Partnership Project, and national standardization bodies like the Telecommunications Standards Development Society of India.

Deployment and Applications

IEEE 802.11p underpins applications such as cooperative awareness messages, decentralized environmental notification, intersection collision avoidance, and platooning demonstrations carried out by automakers like Ford Motor Company, Daimler AG, and Hyundai Motor Company. Field trials and pilot deployments have been executed in regions coordinated by agencies such as the European Commission's C-ITS corridor, the California Department of Transportation, and the Japan Ministry of Land, Infrastructure, Transport and Tourism. Commercial ecosystem participants include suppliers like Harman International, ZF Friedrichshafen AG, and aftermarket integrators collaborating with transport authorities including the New York State Department of Transportation.

Performance and Testing

Performance evaluations rely on channel models and mobility scenarios developed by research groups at Aalto University, KTH Royal Institute of Technology, and the University of Texas at Austin. Conformance and interoperability testing are performed in testbeds provisioned by institutions such as the TRITA test facilities, industry labs operated by NXP Semiconductors and Continental AG, and national test centers like the Japan Automobile Research Institute. Metrics include packet delivery ratio, latency, throughput, and resilience measured under conditions studied by projects funded by the European Commission's Horizon programs and the National Science Foundation. Scenarios for benchmarking reference events and venues where trials occurred, including corridors in Germany, United States, and Japan.

Category:IEEE 802 standards