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SAE J2735-Draft-Rev28 [issued: 11-10-08]
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79 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
6.41 Data Frame: DF_SnapshotTime
Use: To allow Network Users to change the snapshot collection policy based in elapsed time. Two times
and two speeds are included in the message T1, S1 and T2, S2 to be used by the OBE as follows:
If speed is
= S1 then time to next snapshot is T1
- default 20 mph (8.9 m/s) and 6 secs
If speed is
= S2 then time to next snapshot is T2
- default 60 mph (26.8 m/s) and 20 secs
If speed is > S1 and < S2 then time to snapshot is linearly interpolated between T1 and T2
If S1 is set to zero then the time to the next snapshot is always T1
ASN.1 Representation:
SnapshotTime ::= SEQUENCE {
t1 INTEGER(1..99),
-- m/sec - the instantaneous speed when the
-- calculation is performed
s1 INTEGER(0..50),
-- seconds
t2 INTEGER(1..99),
-- m/sec - the instantaneous speed when the
-- calculation is performed
s2 INTEGER(0..50)
-- seconds
}
XML Representation:
<xs:complexType name="SnapshotTime" >
<xs:sequence>
<xs:element name="t1" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:minInclusive value="1"/>
<xs:maxInclusive value="99"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- m/sec - the instantaneous speed when the
calculation is performed -->
<xs:element name="s1" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:maxInclusive value="50"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- seconds -->
<xs:element name="t2" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:minInclusive value="1"/>
<xs:maxInclusive value="99"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- m/sec - the instantaneous speed when the
calculation is performed -->
<xs:element name="s2" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:maxInclusive value="50"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- seconds -->
</xs:sequence>
</xs:complexType>