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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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264 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
20.
Positioning confidence
21.
Probe Segment Number
22.
Rain Sensor
23.
Speed
24.
Speed Confidence
25.
Stability Control Status
DE_StabilityControlStatus
26.
Steering Wheel Angle Rate Of Change
27.
Steering Wheel Angle
28.
Steering Wheel Angle Confidence
29.
Sun Sensor
30.
Time
31.
Time confidence
32.
Tire Location
33.
Tire Pressure Threshold Detection
34.
Tire Pressure
35.
Traction Control State
36.
Vehicle Type
37.
Vertical Acceleration
38.
Wiper Rate
39.
Wiper Status Front
40.
Wiper Status Rear
41.
Yaw Rate
42.
Yaw Rate Confidence
Application and Use with DSRC
The messages in this application are transmitted using the Wave Short Message protocol (WSM) stack in a
single attempt unicast mode on a Service Channel (SCH) determined by the Roadside Unit (RSU) that has
signaled its ability to receive this type of message (based on PSID value and running a suitable
application). Upon reception of such messages they are examined for content and relevance regardless of
the senders ACM.
This is a provider application that employs a Wave Basic Service Set (WBSS) announced by the RSU as
per IEEE 1609.4 Clause 5.3. A confirm-before-join operation is not required by the application in order to
join and/or send Probe Data snapshots. When the application receives a Wave Management Entity (WME)
notification (indicating a WBSS has been joined) from the (WME), it will request access to the WBSS to
send all available snapshots.
This application shall transmit its messages using a PSID of 5, as defined by IEEE 1609.4 or its successors,
and a PSC of 3. Probe Data is a one-way communication stream, vehicle-to-RSU, with no
acknowledgements sent back to the vehicle by the RSU.
Probe Snapshot Generation
A Probe Data Message consists of a series of Probe Data Snapshots taken autonomously as the vehicle
travels. In the absence of any overriding probe management messages (discussed later) snapshots are
generated in three manners:
Periodically – at intervals based on vehicle movement between RSUs
Event Triggered – these occur when the state of certain vehicle status elements change
Starts and Stops – these occur when a vehicle starts moving and stops moving
These snapshots consist of all probe data elements that are available on the vehicle along with the time and
location when each snapshot was taken. Not all vehicles will support all probe data elements when the