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DENM-PDU-Descriptions {
itu-t (0) identified-organization (4) etsi (0) itsDomain (5) wg1 (1) ts (102637) denm (3) version2 (2)
}
DEFINITIONS AUTOMATIC TAGS ::=
BEGIN
ItsPduHeader, Latitude, Longitude, Elevation, Speed, VehicleCommonParameters, ProfileParameters, StationID, TimeStamp, ReferencePositionVehicle
FROM CAM-PDU-Descriptions { itu-t (0) identified-organization (4) etsi (0) itsDomain (5) wg1 (1) ts (102637) cam (2) version1 (1) };
--STF405: doubled defined, renamed
DecentralizedEnvironmentalNotificationMessage ::= SEQUENCE {
management DecentralizedSituationManagement, -- container with DEN management and version control
situation DecentralizedSituation, -- container with event description, incl. type, severity
location DecentralizedSituationLocation, -- container with event location, location referencing with more detailed location description and the relevance area
...
}
DecentralizedSituationManagement::= SEQUENCE {
-- unique identifier about an event from one originator ITS station, combination of node ID and a sequence number
actionID ActionID, -- 6 byte
-- version of the DENM indicating updates from the same originator ITS station; value of 255 is used for the cancellation message sent from the originator ITS station
-- STF405: changed inline definition to explicit
dataVersion DataVersion, -- 1 byte
-- time when the DENM is deleted from the DEN management and the information related to the event is set as invalid.. If it is not provided, it indicates that the expiry time is unkown by the originator ITS station
expiryTime TimeStamp OPTIONAL, -- 6 byte
frequency INTEGER (0..255) OPTIONAL, --1 byte
-- probability of the detected event to be true, varies from 0 to 100, with maximum value as full reliability
reliability INTEGER(0..100), -- 7 bits
-- negates the existence of an event at the event position by a third part ITS station that have received DENMs previously.
isNegation BOOLEAN -- 1 bit
}
-- event description derived from [3]
DecentralizedSituation::= SEQUENCE {
-- traffic status near the event position, defined based on [3], TPEG table tec001
trafficFlowEffect TrafficFlowEffect OPTIONAL, -- 1 byte.
-- event direct cause and sub cause description as defined in tab6.1 and in [3]
-- linked cause if information is available.
linkedCause Situation OPTIONAL, -- 2 Byte,
-- severity value of the event, defined in [3], TPEG table tec003
severity Severity, -- 1 byte
-- characteristics of the event
eventCharact SEQUENCE -- EventCharact OPTIONAL 1 byte
{
-- event mobility description, set to TRUE if the event is in mobility
eventmobility BOOLEAN,
-- whether the event is caused by the originator ITS station, set to TRUE if it is the case. FALSE if it is a location that may cause danger
-- STF405: changed type to be more self explaining
causeType ENUMERATED { itsStation, geographicalRegion },
-- whether the event is physicalling relevant to the receiving ITS station.. Set to TRUE if it is the case
-- STF405: changed type to be more self explaining
relevant ENUMERATED {physicallyRelevant, difficultDrivingConditions },
-- whether the event is time critical road safety event, set to TRUE if it is the case.
timeCritacality BOOLEAN,
-- more characteristics may be added.
...
} OPTIONAL,
-- STF405: changed to profile based on the changes in the CAM module
vehicleCommonParameters VehicleCommonParameters OPTIONAL,
profile ProfileParameters OPTIONAL
}
DecentralizedSituationLocation::= SEQUENCE {
-- description of the event position
-- STF405: as the eventPosition CHOICe is extensible the EventArea type can be added when needed
eventPosition CHOICE {
-- the geographical position of the reference position
...
},
-- description of the relevance area for the DENM dissemination
--STF405: changed DecentralizedSituationLocation to extensible SEQUENCE, so that definition of RelevanceArea can be added when needed!
--relevanceArea RelevanceArea,
-- location referencing of the event position
locationRef CHOICE {
-- consequence position of the trace location referencing mechanism
--STF405: created following EventPosition definition, as requested by WG1
EventPosition ::= SEQUENCE {
refPosition ReferencePositionVehicle,
eventSpeed Speed OPTIONAL -- event speed, either equal to or different from the vehicle speed
}
ActionID ::= SEQUENCE {
stationID StationID, -- a 4 byte value
sequenceNo SequenceNo -- a 2 byte value
}
SequenceNo ::= INTEGER (0..65535) -- increased by 1 each time a new event is detected by the same ITS station.
-- STF405: changed to INTEGER as ENUMERATED is not applicable for handling
DataVersion ::= INTEGER {firstVersion(0),secondVersion(1),cancellation(255) } (0..255)
--STF405: removed the (mis-spelled) Frenquency type, as it has been unused, because frequency field uses an inline definition instead
-- Frenquency ::= INTEGER (0..255)
--STF405: removed OPTIONAL, as it is syntactically incorrect
TrafficFlowEffect ::= INTEGER {
trafficFlowUnknown(1),
freeTrafficFlow(2),
slowTraffic(3),
heavyTraffic(4),
queuingTraffic(5),
stationaryTraffic(6),
noTrafficFlow(7)
} (0..7)
Situation ::= SEQUENCE {
cause CauseCode, -- 1 byte
subCause SubCauseCode -- 1 byte
}
-- STF405: Changed to INTEGER as it allows to use cause codes in [3]
-- 1 to 100 indicates causecode defined within [3]
-- 101 – 255 indicates causecode without being defined by [3]
CauseCode ::= INTEGER {reserved(0),dangerousDriving(101),intersectionViolation(102),vehicleProblem(103),intersectionCollision(104),hazardousLocation(105) } (0..255)
-- STF405: changed type as it seems more applicable
SubCauseCode ::= INTEGER {unknown(0)} (0..255)
--STF405: removed LinkedCause definition, as it is not used anywhere (linkedCause field directly invokes Situation type)
-- LinkedCause ::= Situation
--STF405: renamed to Severity
Severity ::= ENUMERATED -- 1 byte
{
informative (1),
-- Text example: <Attention, there is a dangerous obstruction due to fog>
obstacles (2), --danger level 1
-- Text example: <Attention, there a danger due to fog>
danger (3), --danger level 2:
-- Text example: <Attention, highest danger due to fog>
highestDanger (4) --danger level 3:
}
--STF405: removed following three definitions, which are now redundant (and have been partly inconsistent with CAM anyway)
-- Altitude ::= INTEGER (-10000..16767215)
-- PositionAccuracy ::= OCTET STRING (SIZE(4))
-- Speed ::= INTEGER (-32765..32765)
--3 bits, identifier of the trace
--5 bits, number of waypoint positions included in the trace
waypoints SEQUENCE (SIZE(0..31)) OF Waypoint
}
Waypoint ::= SEQUENCE{
-- waypoint positions included in the trace.
ptLat Latitude, --a 4 bytes value
ptLong Longitude, --a 4 bytes value
--STF405: type name is made consistent with CAM definitions
ptAlt Elevation,