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- Connected V2V safety applications are built around the SAE J2735 BSM, which has two parts
- BSM Part 1:
- Contains the core data elements (vehicle size, position, speed, heading acceleration, brake system status)
- Transmitted approximately 10x per second
- BSM Part 2:
- Added to part 1 depending upon events (e.g., ABS activated)
- Contains a variable set of data elements drawn from many optional data elements (availability by vehicle model varies)
- Transmitted less frequently
- No on-vehicle BSM storage of BSM data
- The BSM is transmitted over DSRC (range ~1,000 meters)
- BSM Part 1:
- The BSM is tailored for low latency, localized broadcast required by V2V safety applications
Areas of Concern:
- BSM Part one does not include a direct timestamp that identifies the time at which the message was captured. Its contains an offset, but that only represents a period in which the time has been valid.