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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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60 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Used by: This entry is used directly by one other data structure in this standard, a MSG called
MSG_ProbeDataManagement <ASN> <XML>. In addition, this item may be used by data structures
in other ITS standards.
Remarks: From the VII POC-A team.
6.33 Data Frame: DF_SpeedandHeadingConfidence
Use: A single byte long data frame combining multiple related bit fields into one byte.
ASN.1 Representation:
SpeedandHeadingConfidence ::= SEQUENCE {
heading HeadingConfidence, -- 3 bits
speed SpeedConfidence, -- 3 bits
throttle ThrottleConfidence -- 2 bits
}
XML Representation:
<xs:complexType name="SpeedandHeadingConfidence" >
<xs:sequence>
<xs:element name="heading" type="HeadingConfidence" />
<!-- 3 bits -->
<xs:element name="speed" type="SpeedConfidence" />
<!-- 3 bits -->
<xs:element name="throttle" type="ThrottleConfidence" />
<!-- 2 bits -->
</xs:sequence>
</xs:complexType>
Used by: This entry is directly used by the following 4 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
DF
<XML>, and
DF
<XML>, and
DF
<XML>, and
DF
In addition, this item may be used by data structures in other ITS standards.
6.34 Data Frame: DF_Tail
Use: This data structure is a way to add pairs of names and associated values to a message. It typically
appears at the end of a message (hence the name "tail"). The value carried in this portion of the message
shall not be used to circumvent the structure of the messages. That said, this is an excellent way to add
further meta-data to a message or to add content which a local deployment feels is needed but, which is not
currently in the message set.
ASN.1 Representation:
Tail ::= SEQUENCE
{
entries SEQUENCE (SIZE (1..32)) OF SEQUENCE {
tag UTF8String (SIZE(1..20)),
value UTF8String (SIZE(1..200))
}
-- sets of addtional named data values
}
XML Representation:
<xs:complexType name="Tail">
<xs:sequence maxOccurs="32">
<xs:element name="entry">