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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

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    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) };

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--STF405: all unnecessary tags have been removed

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DenmPdu ::= SEQUENCE {
	header	ItsPduHeader,	
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	denm	DecentralizedEnvironmentalNotificationMessage

}


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--STF405: doubled defined, renamed
DecentralizedEnvironmentalNotificationMessage ::= SEQUENCE {
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	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 {
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	-- unique identifier about an event from one originator ITS station, combination of node ID and a sequence number
	actionID	ActionID,	-- 6 byte
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	-- 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
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	-- 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	
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	expiryTime	TimeStamp  	OPTIONAL, 	-- 6 byte
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	frequency	INTEGER (0..255)	OPTIONAL, 	--units of 0.1 Hz
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	-- 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]
	situation	Situation,
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	-- 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 
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	eventCharact	SEQUENCE -- EventCharact 1 byte 
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	{
		-- event mobility description, set to TRUE if the event is in mobility 
		eventmobility	BOOLEAN,
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		-- whether the event is caused by the originator ITS station
-- STF405: changed type to be more self explaining
		causeType   ENUMERATED { itsStation, geographicalRegion },
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		-- whether the event is physicalling relevant to the  receiving ITS station.
-- STF405: changed type to be more self explaining
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        relevance ENUMERATED {physicallyRelevant, difficultDrivingConditions },
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		-- whether the event is time critical road safety event, set to TRUE if it is the case.
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		timeCriticality	BOOLEAN,
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		-- more characteristics may be added. 	
		...
	} OPTIONAL,
	-- STF405: changed to profile based on the changes in the CAM module
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	vehicleCommonParameters	VehicleCommonParameters OPTIONAL,
	profile ProfileParameters    OPTIONAL
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}

DecentralizedSituationLocation::= SEQUENCE {
	-- description of the event position
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	-- STF405: as the eventPosition CHOICe is extensible the EventArea type can be added when needed
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	eventPosition	CHOICE	{
		-- the geographical position of the reference position 
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		eventPositionCurrentDefinition	EventPosition,
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		...
	},
	-- description of  the relevance area for the  DENM dissemination
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	--STF405:  changed DecentralizedSituationLocation to extensible SEQUENCE, so that definition of RelevanceArea can be added when needed!
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	--relevanceArea	RelevanceArea,
	-- location referencing of the event position
	locationRef	CHOICE {
		-- consequence position of the trace location referencing mechanism
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		trace	TraceLocData,
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		-- more location referencing mechanism to be added
		...
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	},
	...
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}

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--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
}

		
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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)
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--STF405: removed the (mis-spelled) Frenquency type, as it has been unused, because frequency field uses an inline definition instead
-- Frenquency ::=	INTEGER (0..255)
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--STF405: removed OPTIONAL, as it is syntactically incorrect
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TrafficFlowEffect ::= 	INTEGER (0..7)
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Situation ::= SEQUENCE {
	cause 		CauseCode, 	-- 1 byte
	subCause	SubCauseCode	-- 1 byte
}

-- STF405: Changed to INTEGER as it allows to use cause codes in [3]
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-- 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)
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--STF405: removed LinkedCause definition, as it is not used anywhere (linkedCause field directly invokes Situation type)
-- LinkedCause ::= 	Situation
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--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: 
}

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--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)
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TraceLocData ::=	SEQUENCE {
	--3 bits, identifier of the trace
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	traceID	INTEGER(0 .. 7),	
	--5 bits, number of waypoint positions included in the trace
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	waypoints	SEQUENCE (SIZE(0..31)) OF	Waypoint
}

Waypoint  ::=		SEQUENCE{
	--  waypoint positions included in the trace.	
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	ptLat 	Latitude,							--a 4 bytes value 
	ptLong 	Longitude,						--a 4 bytes value
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--STF405: type name is made consistent with CAM definitions
	ptAlt 	Elevation,
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	...
	--STF405: removed repetition
}