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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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240 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
In all seven of the following application scenarios, a working GPS unit
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and a connection to the vehicle
data bus, in addition to a DSRC radio unit, are necessary to send out the correct information to, and receive
the necessary information from, other vehicles.
Annex C-1 Intersection Collision Warning
Application Description
This application warns drivers when a side-impact or straight crossing path collision at an intersection is
probable. DSRC communications can be used to allow a vehicle approaching an intersection to detect all
nearby vehicles, their position, velocity, acceleration, and turning status. The in-vehicle unit analyzes these
parameters for the other vehicles as contained in their MSG_BasicSafetyMessages and projects future
vectors for these vehicles. If this analysis determines that a collision is likely, an appropriate warning is
issued to the driver.
Flow of Events
Flow of events
1.
Vehicle “A” sends MSG_BasicSafetyMessage,
2.
Vehicle “B” receives message
3.
Vehicle “B” processes the message from Vehicle A and determines that Vehicle A’s message
is relevant (crossing road segment via map and/or heading)
4.
Vehicle “B” alerts its driver to a straight crossing path hazard.
Hardware Devices:
DSRC radio
Positional and vehicle sensors
Human-Machine Interface
Occupant
Vehicle
System
Driver
Passenger
Service
Provider
Road
Department[JBK7]
Actors: (What entities play
an active role in use)
X
X
Support information:
CAMP-VSC Task 3 Report, 2003
Concept of Operations
For this application, it is assumed that all identified subject vehicles would be equipped with DSRC units. It
is also assumed that messages from each vehicle would be received by conflicting vehicles on other
intersection legs, a process that might involve high transmission power or relaying techniques if the
transmitter and receiver do not have clear line of sight.
Upon receipt of each MSG_BasicSafetyMessage, the recipient needs to implement an algorithm to
determine if a crossing path conflict is present. Once a conflict is determined the vehicle could use
appropriate human machine interface (HMI) techniques aboard the vehicle to issue a warning to the driver.
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Which is presumed to be able to provide position, velocity, and current time values for the vehicle.