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Dedicated Short Range Communication at 915 MHz Standards Group
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Overview:
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Dedicated Short Range Communications (DSRC) is a general purpose RF communications link between the vehicle and the roadside, or between two vehicles. The set of standards developed to support this interface provide a short to medium range communications service for a variety of applications, including public safety (obstacle detection, collision avoidance), commercial vehicle applications (weigh-in-motion/inspection clearances, border crossing), electronic toll collection, parking lot payment, and many others.
There are two groups of standards supporting DSRC applications, each operating in a different band: 915 MHz and 5.9 GHz. A set of 915 MHz DSRC standards was completed several years ago and is primarily used in commercial vehicle applications, although they also support other applications such as electronic toll collection. The set of 5.9 GHz DSRC standards is still under development, and is being designed to support a larger variety of higher data bandwidth applications, including advanced vehicle control, traveler information, increased freight/cargo transport support, transit, parking, and traffic management (see DSRC 5GHz Standards Group).
The DSRC 915MHz Standards Group includes standards covering the rules for communicating between in-vehicle ITS systems and roadside equipment, and are common across all of the vehicle-to-roadside interfaces in the National ITS Architecture. The standards that describe the “vocabulary” (called data elements and messages) are specific to certain architecture flows, and are therefore only mapped to the relevant flows.
In commercial vehicle (CVO) applications, this standard group covers the interface between commercial vehicles and roadside equipment. The two standards in this group together with “IEEE Std 1455-1999: Standard for Message Sets for Vehicle/Roadside Communications” are commonly known as the “sandwich spec”, and are used as a set for the majority of CVO programs. The physical layer is used in active mode and the data link layer in synchronous mode to facilitate national interoperability.
In commercial vehicle (CVO) applications, this Group includes the “sandwich spec” as defined in the Federal Register:
- FHWA Docket No. FHWA 99-5844; December 30, 1999: Dedicated Short Range Communications in Intelligent Transportation Systems (ITS) Commercial Vehicle Operations
For non-commercial vehicle (CVO) applications, this Group includes the following Standards Activities:
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Includes:
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| Document ID
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Standard Title
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| ASTM PS 105-99
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Standard Provisional Specification for Dedicated Short Range Communication (DSRC) Data Link Layer
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| ASTM E2158-01
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Standard Specification for Dedicated Short Range Communication (DSRC) Physical Layer using Microwave in the 902-928 MHz Band
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