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Dedicated Short Range Communication at 5.9 GHz Standards Group
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 (see DSRC 915MHz Standards Group). 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 (this DSRC 5GHz Standards Group).
The DSRC 5GHz Standards Group includes standards covering the rules for communicating between in-vehicle ITS systems and roadside equipment. The standard that describes the vocabulary (called data elements and messages) is at the early stages of development by SAE and has been preliminarily entitled "Data Dictionary and Message Sets for DSRC 5.9 GHz". Since it is specific to certain architecture flows, it will be only mapped to the relevant flows.
The standards within the DSRC 5GHz Standards Group offer a significantly higher data bandwidth than DSRC in the 915 MHz band, and has a larger range. Although envisioned primarily for public safety applications, the possible 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. The ITS standards in this group are currently under development, although significant progress has been made since they are based on IEEE’s wireless LAN industry standard 802.11.
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Includes:
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None
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