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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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145 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
<xs:documentation>
as per IEEE 1609.4 use
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedByte"/>
</xs:simpleType>
Remarks: Taken at a defined snapshot event to define RSU coverage patterns such as the moment an OBU joins
or becomes associated with an RSU and can send probe data.
9.7 Data Frame: DF_Application Context Mark
Use: The Application Context Mark (ACM) provides a unique means of identifying each element of each specific
application. A priority is assigned to each ACM, allowing a single application to utilize different priorities for
different elements.
ASN.1 Representation:
AppContextMark ::= SEQUENCE SEQUENCE {
said SpecificApplicationIdentification, -- SAID
context Context, -- see appropriate Appendix
priority Priority -- in accordance with IEEE P1609
...
}
XML Representation:
<xs:complexType name="AppContextMark" >
<xs:sequence>
</xs:sequence>
</xs:complexType>
Used by: This entry is used directly by one other data structure in this standard, a DF called DF_ValueList <ASN>
<XML>. In addition, this item may be used by data structures in other ITS standards.
9.8 Data Frame: DF_DDate
Use: The DSRC style date is a compound value consisting of finite-length sequences of integers (not characters) of
the form: "yyyy, mm, dd" - as defined below. Because the length of each element is known, no inner element
tagging is normally used in transmission. Thus, this data frame occupies 4 bytes in total.
ASN.1 Representation:
DDate ::= SEQUENCE SEQUENCE {
year DYear, -- 2 bytes
month DMonth, -- 1 byte
day DDay, -- 1 byte
}
XML Representation:
<xs:complexType name="DDate" >
<xs:sequence>
</xs:sequence>
</xs:complexType>
Used by: This entry is used directly by one other data structure in this standard, a DF called DF_ValueList <ASN>
<XML>. In addition, this item may be used by data structures in other ITS standards.
9.9 Data Frame: DF_DDateTime
Use: The DSRC style date is a compound value consisting of finite-length sequences of integers (not characters) of
the form: "yyyy, mm, dd, hh, mm, ss (sss+) (offset)" - as defined below. Because the length of each element is
known, no inner element tagging is normally used in transmission. Thus, this data frame occupies 10 bytes in
total, and 8 bytes when the time offset is not present. In typical use in DSRC applications there is no need to
send the offset representing the local time zone, so the most common representation for the data frame occupies
8 bytes and provides a resolution of one millisecond.