DSRC 5GHz: Dedicated Short Range Communication at 5.9 GHz Standards Group (Standard* Activities Group)

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 warnings and avoidance, intersection safety), commercial vehicle applications (weigh-in-motion/inspection clearances, border crossing), electronic toll collection, parking lot payment, in-vehicle signing, and many others.

There are two groups of standards supporting DSRC applications, each operating in a different frequency 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, electronic toll collection, and other applications. The set of 5.9 GHz DSRC standards, the majority of which were approved in 2006 or have been voted on and are undergoing revision for approval, are designed to support a larger variety of applications, including collision avoidance, advanced vehicle control, traveler information, increased freight/cargo transport support, transit, parking, and traffic management as well as supporting other private applications (this DSRC 5GHz Standards Group).

The DSRC 5GHz Standards Group includes standards covering the protocols for communicating between in-vehicle ITS systems and roadside equipment, or between two vehicles. The standard that describes the vocabulary (called data elements and messages) is currently available from SAE and is entitled "SAE J2735: Dedicated Short Range Communications (DSRC) Message Set Dictionary". Since it is specific to certain architecture flows, it will only be mapped to the relevant flows.

The standards within the DSRC 5GHz Standards Group offer a significantly higher information capacity than DSRC in the 915 MHz band, and have a longer range. Although envisioned primarily for public safety applications, the possible ITS uses for this spectrum vary widely including vehicle-to-vehicle communications, automated vehicle maintenance record downloads to ITS systems in transit garages, work zone or highway-rail intersection warnings to drivers, road condition warnings, electronic toll collection, and so forth. The equipment required to support 5.9 GHz DSRC is different from that required for 915 MHz DSRC, and therefore early deployment and migration decisions should be made. Many of the ITS standards in this group are already published or well under development since they are based on IEEE’s wireless LAN industry standard 802.11.

Source Architecture Flow Destination
Emergency Vehicle local signal preemption request Roadway
Emergency Vehicle emergency vehicle alert Vehicle
Emergency Vehicle vehicle signage data Vehicle
Maintenance and Construction Vehicle vehicle signage data Vehicle
Other Vehicle vehicle intersection safety data Vehicle
Other Vehicle vehicle safety data Vehicle
Parking Management vehicle parking information Vehicle
Parking Management vehicle payment request Vehicle
Parking Management vehicle payment update Vehicle
Roadway broadcast traveler information Vehicle
Roadway intersection status Vehicle
Roadway roadway safety data Vehicle
Roadway vehicle signage data Vehicle
Roadway Payment vehicle payment request Vehicle
Roadway Payment vehicle payment update Vehicle
Transit Vehicle local signal priority request Roadway
Transit Vehicle vehicle signage data Vehicle
Vehicle vehicle intersection safety data Other Vehicle
Vehicle vehicle safety data Other Vehicle
Vehicle vehicle payment information Parking Management
Vehicle environmental probe data Roadway
Vehicle probe archive data Roadway
Vehicle traffic probe data Roadway
Vehicle vehicle intersection safety data Roadway
Vehicle vehicle profile Roadway
Vehicle vehicle safety data Roadway
Vehicle vehicle payment information Roadway Payment