United States Department of Transportation
i
Vehicle information exchange needs for mobility applications : version 3.0.
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2013-04-01
[PDF-955.91 KB]
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Abstract:Connected Vehicle to Vehicle (V2V) safety applications heavily rely on the BSM, which is one of the messages defined in the Society of Automotive
standard J2735, Dedicated Short Range Communications (DSRC) Message Set Dictionary, November 2009. The BSM is broadcast from vehicles
over the 5.9 GHz DSRC band. Transmission range is on the order of 1,000 meters. The BSM consists of two parts:
• BSM Part 1: core data elements, including vehicle position, heading, speed, acceleration, steering wheel angle, and vehicle size, transmitted at
an adjustable rate of about 10 times per second
• BSM Part 2: a variable set of data elements drawn from an extensive list of optional elements. Some of these elements are periodically included
in a subset of BSM messages at a frequency that is TBD while others are included if certain triggering events occur, e.g., ABS activated. They
are added to Part 1 and sent as part of the BSM message, but are transmitted less frequently in order to conserve bandwidth
Based on existing documentation of the high priority Dynamic Mobility Applications (DMA), an assessment was made of the information that needs to
flow to and from vehicles in order to support these applications, as well as the connected vehicle road weather program. The goals were determine the
extent to which the Basic Safety Message (BSM) can support those needs and what additional data elements and messages would be required.
The primary findings of the analysis are:
1.The Basic Safety Message (BSM), with Part 1 transmitted approximately 10 times per second over Dedicated Short Range Communications
(DSRC), is useful for a number of mobility applications, but is not solely sufficient for any of the envisioned mobility applications.
2. TheBSM message and DSRC communications are required for some mobility applications, such as the M-ISIG bundle of applications.
3. A subset of the BSM Part 1 and Part 2 data elements provides the majority, but not all, of the data that needs to be sent from vehicles to the
infrastructure. This data must either be continually sent to infrastructure systems, at some lower update rate, over an alternative mobile wireless
technology, such as cellular data, or be cached on-board the vehicle and then sent in a message containing both current and stored snapshots.
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