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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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56 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
values to save those bytes.
6.28 Data Frame: DF_Sample
Use: Allows the Probe Management message to apply its settings to a random sample of vehicles. This
uses the last two digits of the current probe segment number (PSN) to determine if probe management is to
be used. If the current PSN falls between these two (2) values, then the Probe Data Management policy
should be applied. The numbers are inclusive e.g. using 41 and 43 would provide a 3% sample and 00..49
would be a 50% sample.
ASN.1 Representation:
Sample ::= SEQUENCE {
sampleStart INTEGER(0..99), -- Sample Starting Point
sampleEnd INTEGER(0..99) -- Sample Ending Point
}
XML Representation:
<xs:complexType name="Sample" >
<xs:sequence>
<xs:element name="sampleStart" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:maxInclusive value="99"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- Sample Starting Point -->
<xs:element name="sampleEnd" >
<xs:simpleType>
<xs:restriction base="xs:unsignedByte">
<xs:maxInclusive value="99"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<!-- Sample Ending Point -->
</xs:sequence>
</xs:complexType>
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.
6.29 Data Frame: DF_SnapshotDistance
Use: To allow Network Users to change the snapshot collection policy based on speed and distance. Two
distances and two speeds are included in this Data Frame D1, S1 and D2, S2 to be used by the OBE as
follows:
If speed is
= S1 then distance to next snapshot is D1
If speed is
= S2 then distance to next snapshot is D2
If speed is > S1 and < S2 then distance to snapshot is linearly interpolated between D1 and D2
If S1 is set to zero then the distance to the next snapshot is always D1.
ASN.1 Representation:
SnapshotDistance ::= SEQUENCE {
d1 INTEGER(0..999), -- meters
s1 INTEGER(0..50), -- meters\second
d2 INTEGER(0..999), -- meters
s2 INTEGER(0..50) -- meters\second