Dedicated short-range communications (DSRC) is a technology for direct wireless exchange of vehicle-to-everything (V2X) and other intelligent transportation systems (ITS) data between vehicles, other road users (pedestrians, cyclists, etc.), and roadside infrastructure (traffic signals, electronic message signs, etc.).[1] DSRC, which can be used for both one- and two-way data exchanges, uses channels in the licensed 5.9 GHz band. DSRC is based on IEEE 802.11p.
Historyedit
In October 1999, the United States Federal Communications Commission (FCC) allocated 75 MHz of spectrum in the 5.9 GHz band for DSRC-based ITS uses.[2][3] By 2003, DSRC was used in Europe and Japan for electronic toll collection.[4] In August 2008, the European Telecommunications Standards Institute (ETSI) allocated 30 MHz of spectrum in the 5.9 GHz band for ITS.[5]
In November 2020, the FCC reallocated the lower 45 MHz of the 75 MHz spectrum to the neighboring 5.8 GHz ISM band for unlicensed non-ITS uses, citing DSRC's lack of adoption. Of the 30 MHz that remained for licensed ITS uses, 10 MHz was kept for DSRC (Channel 180, 5.895–5.905 GHz) and 20 MHz was reserved for a successor to DSRC, LTE-CV2X (Channel 183, 5.905–5.925 GHz).[6][7][3]
Applicationsedit
Singapore's Electronic Road Pricing scheme plans to use DSRC technology for road use measurement (ERP2) to replace its ERP1 overhead gantry method.[8]
In June 2017, the Utah Department of Transportation and the Utah Transit Authority (UTA) demonstrated the use of DSRC for transit signal priority on SR-68 (Redwood Road) in Salt Lake City, whereby several UTA transit buses equipped with DSRC equipment could request changes to signal timing if they were running behind schedule.
DSRC systems in Europe, Japan and the U.S. are incompatible and have significant differences, including spectrum and channels (5.8 GHz RF, 5.9 GHz RF, infrared), data transmission rates, and protocols.[citation needed]
^"DSRC Standards: What's New?". ITS Standards Advisory number 3. US Department of Transportation. April 2003. Archived from the original on February 16, 2013. Retrieved September 9, 2013.
^"European Telecommunications Standards Institute. News release, September 2008". ETSI. Archived from the original on 2012-02-18. Retrieved 2009-08-16.
^"FCC Modernizes 5.9 GHz Band to Improve Wi-Fi and Automotive Safety" (PDF).
^ De Palma, André; Lindsey, Robin (2011). "Traffic congestion pricing methodologies and technologies". Transportation Research Part C: Emerging Technologies. 19 (6): 1377–1399. doi:10.1016/j.trc.2011.02.010.
External linksedit
Performance Evaluation of Short-Range Communication Links for Road Transport & Traffic Telematics (in German)
A comparison of different technologies for EFC and other ITS applications Archived 2012-07-17 at the Wayback Machine
Connectsafe Wireless Vehicle Communication System - University of South Australia
Dedicated Short-Range Communications (DSRC) Fact Sheet – U.S. Department of Transportation ITS JPO