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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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61 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
7.14 Data Element: DE_DSecond
Use: The DSRC style second is a simple value consisting of integer values from zero to 60000 representing the
milliseconds within a minute. A leap second is represented by the value 60000. The value of 65535 SHALL
represent an unknown value in the range of the minute, other values from 60001 to 65534 are reserved.
ASN.1 Representation:
DSecond ::= INTEGER (0..65535) -- units of miliseconds
XML Representation:
<xs:simpleType name="DSecond" >
<xs:annotation>
<xs:documentation>
units of miliseconds
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedShort"/>
</xs:simpleType>
Used by: This entry is directly used by the following 5 other data structures in this standard (record type, descriptive name,
ASN.1, and XML name (if present) of each):
DF
DF
DF
DF
MSG
In addition, this item may be used by data structures in other ITS standards.
Remarks: The need for a leap second arises from the difference between solar time and UTC time. Here is a
useful reference on this topic: http://en.wikipedia.org/wiki/Leap_second
7.15 Data Element: DE_DSRC MessageID
Use: The DSRC Message ID is an element used to define which type of message follows in the messages of this
standard. The values for ACID and ACM of a given application are contained in a lower layer of the WSMP
process, and along with the message itself, are presented to the application after being transported as a stream of
bytes. This data element is typically the first byte and used to tell the receiving application how to interpret the
remaining bytes (i.e. what message structure has been used).
ASN.1 Representation:
DSRCmsgID ::= ENUMERATED {
reserved (0),
alaCarteMessage (1),
basicSafetyMessage (2),
commonSafetyRequest (3),
emergencyVehicleAlert (4),
genericTransferMsg (5),
probeVehicleData (6),
... -- # LOCAL_CONTENT
}
-- values to 127 reserved for std use
XML Representation:
<xs:simpleType name="DSRCmsgID" >
<xs:annotation>
<xs:appinfo>
reserved (0)
alaCarteMessage (1)