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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
10.
Application And Use With DSRC
The messages in this application are transmitted using the Wave Short Message Protocol (WSMP) stack in
a single attempt unicast mode on a Service Channel (SCH) determined by the Roadside Equipment (RSE)
sent to the RSE that has determined to receive this type of message (based on ACID 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 employ’s a Wave Basic Service Set (WBSS) announced by the RSE 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 WME-Notification.ind
(indicating a WBSS has been joined) from the Wave Management Entity (WME), it will request access to
the WBSS to send all available snapshots.
This application shall transmit its messages using an Application Class ID (ACID) of “5”, as defined by
IEEE 1609.4 or its successors, and an Application Context Mark (ACM) of “3”. Probe Data is a one-way
communication stream, vehicle-to-RSE, with no acknowledgements sent back to the vehicle by the RSE.
Multiple applications are expected to be found operating in overlapping local coverage areas. Probe Data
messages shall have an application priority of “0” (low) for all vehicle types. The application control field
(ACF) of this application shall be set to __?__ (explain any needs here). The default repetition rate for
unicast Probe Data messages is to be one new message set when the OBE encounters a new RSE. This
repetition rate may be modified utilizing the Probe data Management Message describe above.