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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Therefore, this is a provider application that does not employ a Wave Basic Service Set (WBSS) as per
IEEE 1609.4 Clause 5.3 and there is no confirm and join operations. Receivers of these messages are
expected to process all such message regardless of the PSC found (typically each device running a provider
application will have its own PSC to further classify its transmissions).
This application shall transmit its messages using an PSID value of “19” [the “emergency-warning”
service] as defined by IEEE 1609.4 or its successors. Multiple applications, each with their own PSC data,
are expected to be found operating in overlapping local coverage areas but using the same PSID and this
message set. Based on the data exchanged in this application, devices may determine the need to initiate
other services or applications using other PSID values. The message priority of this application shall be
set, as per Annex A of this document, to the value determined for devices sending this message. The
expected repetition rate for the messages broadcast in this application is nominally to be one new message
every half second for BER-DER WSM encodings. The expected repetition rate for the messages broadcast
in this application is nominally to be one new message every two seconds for XML encodings. These
values may vary based on other system allocation requirements.