Vehicle Information Exchange Needs for Mobility Applications
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Vehicle Information Exchange Needs for Mobility Applications

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    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:

    • Contains core data elements, including vehicle position, heading, speed, acceleration, steering wheel angle, and vehicle size

    • It is transmitted at an adjustable rate of about 10 times per second

    • BSM Part 2:

    • Contains a variable set of data elements drawn from an extensive list of optional elements. They are selected based on event triggers, 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

    The BSM message includes only current snapshots (with the exception of path data which is itself limited to a few second’s worth of past history data).

    A preliminary assessment of the information that needs to flow to and from vehicles in order to support thirty high priority applications identified by the Dynamic Mobility Applications (DMA) program was conducted to determine the extent to which the Basic Safety Message (BSM) can support those needs. The concepts of operation and system requirements for these DMA applications are still under development. As a result, the findings will undoubtedly change as more information becomes available.

    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 limited subset of mobility applications, but is not solely sufficient for most applications, especially since complete roadway coverage using DSRC has never been envisioned as a feasible option.

    2. A subset of the BSM Part 1 and Part 2 data, if cached, bundled, and sent in another manner (e.g., periodic transmission of both current and history data over cellular networks), adequately provides the vehicle-based information needed for most mobility applications. The major exception is crash-related data to support the MAYDAY application.

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