 |
 |
 |
 |
|
 |
 |
SAE J2735-Draft-Rev26 [issued: 09-18-08]
-
165 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Remarks: Used in the SignalState definition (a complex octet encoding).
7.108 Data Element: DE_ProbeSegmentNumber
Use: The PSN enables users to identify vehicle trajectory for a limited amount of time or over a limited
distance. It is randomly generated by a vehicle every 120 seconds or 1km, whichever comes last. The
interval between PSN changes is a random number of seconds between 0 and 10s or a random distance
between 0 and 200m, whichever comes last. When sending messages containing a PSN, each message
must contain a single PSN.
For Example when using the PSN in a Probe Data snapshot, all snapshots contained within a single
message must contain the same PSN. All remaining Snapshots with a PSN that has already been sent to an
RSE will be purged when the RSE communication link is broken. Event based Snapshots will not contain a
PSN.
ASN.1 Representation:
ProbeSegmentNumber ::= INTEGER (0..255)
-- is this large enough,
-- or should we use 2 bytes?
XML Representation:
<xs:simpleType name="ProbeSegmentNumber" >
<xs:annotation>
<xs:documentation>
is this large enough,
or should we use 2 bytes?
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedByte"/>
</xs:simpleType>
Used By: This entry is used directly by one other data structure in this standard, a MSG called
MSG_ProbeVehicleData <ASN> <XML>. In addition, this item may be used by data structures in
other ITS standards.
7.109 Data Element: DE_PublicSafetyVehicleApproaching
Use: The PublicSafetyVehicleApproaching data element will be used to enumerate various type of
preemption events.
ASN.1 Representation:
PublicSafetyVehicleApproaching ::= ENUMERATED {
itemOne (0),
itemTwo (1), -- add any comments here
itemThree (2),
itemFour (3),
... -- # LOCAL_CONTENT
}
-- values to 127 reserved for std use
-- values 128 to 255 reserved for local use
XML Representation:
<xs:simpleType name="PublicSafetyVehicleApproaching" >
<xs:annotation>
<xs:appinfo>
itemOne (0)
itemTwo (1) -- add any comments here
itemThree (2)
itemFour (3)
</xs:appinfo>
<xs:documentation>
values to 127 reserved for std use
values 128 to 255 reserved for local use
</xs:documentation>
 |