DENM.asn

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

IMPORTS 
    Latitude, Longitude, Elevation, BasicVehicle, 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: all unnecessary tags have been removed


ItsPduHeader ::= SEQUENCE {
	-- protocolVersion fixed to 0
	protocolVersion		INTEGER(0..255),

	-- message type ID associated to DENM = 1
	messageID 		INTEGER(0..255),

	-- milliseconds elapsed since midnight January 1st, 1970 UTC
	generationTime	TimeStamp,
	
	denm	DecentralizedEnvironmentalNotificationMessage

}


--STF405: doubled defined, renamed
--DecentralizedSituation ::= SEQUENCE {
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	INTEGER(0..255),
	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]
	situation	Situation,
	-- 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	BOOLEAN,
		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	BOOLEAN,
        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,
	-- tagged list to provide supplementary information  describing the event, may include DEs and EFs definied in [i.6] or [6]		
	-- STF405: changed to profile based on the changes in the CAM module
	-- taggedList	SET SIZE(0..32) OF TaggedList OPTIONAL 
	-- optional taggedlist with TaggedValue  OPTIONAL
	commonParameters	BasicVehicle 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 
--		refPosition	RefPosition,	
		refPosition	ReferencePositionVehicle,	
		...
	},
	-- 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
		trace	TraceLocData,
		-- more location referencing mechanism to be added
		...
	},
	...
}


--STF405: changed MessageID to inline definition, as in CAM
--MessageID ::=  	INTEGER (0..255) 

--STF405: uses imported TimeStamp type instead as this is actually referenced, LongTimeStamp never
--LongTimeStamp ::=	INTEGER (0.. 281474976710655)		

ActionID ::= SEQUENCE {
	stationID 	StationID,	-- a 4 byte value
	sequenceNo 	SequenceNo	-- a 2 byte value
}

--STF405: STRING not a valid ASN.1 type, using the CAM definition
--StationID ::=	STRING 		
-- station ID of the DENM originator ITS station	

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 ::= ENUMERATED {
-- 	firstVersion	(0),
-- 	secondVersion	(1),
-- 	cancellation	(255),
-- 	...
-- }
DataVersion ::= INTEGER {firstVersion(0),secondVersion(1),cancellation(255) } (0..255)

--STF405: removed as is expressed already in TimeStamp which is referenced only, furthermore OPTIONAL is syntactically incorrect
--LongTimeStamp ::=	INTEGER (0.. 281474976710655) 	OPTIONAL
-- 6byte, units of milliseconds.

Frenquency ::=	INTEGER (0..255)

-- STF405: no need for explicit type
--Reliability ::=	INTEGER (0..100)	
--7 bit

-- STF405: no need for explicit type
-- IsNegation ::=	BOOLEAN	
--1 bit

--STF405: removed OPTIONAL, as it is syntactically incorrect
--TrafficFlowEffect ::= 	INTEGER(0..7)	OPTIONAL
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]
-- CauseCode ::= ENUMERATED  

-- 1 to 100 indicates causecode defined within [3]
-- 101 – 255 indicates causecode without being defined by [3]

-- {
--	reserved		(0),
--	dangerousDriving	(101),
--	intersectionViolation	(102),
--	vehicleProblem	(103),
--	intersectionCollision	(104),
--	hazardousLocation	(105),
--	...
--}
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 ::= ENUMERATED
-- {
-- 	unknown		(0),
-- 	subCauseCode1	(1),
-- 	subCauseCode2	(2),
-- 	...
-- }													
SubCauseCode ::= INTEGER {unknown(0)} (0..255)

--STF405: removed OPTIONAL, as it is syntactically incorrect
--LinkedCause ::= 	Situation		OPTIONAL
LinkedCause ::= 	Situation

--STF405: renamed to Severity
--LongTimeStamp ::= ENUMERATED...
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: no need for explicit type
--EventCharact ::= SEQUENCE	
-- 1 byte
--{
-- whether the detected event is in mobility (moving vehicle) or static
--	mobility		BOOLEAN,
-- whether the detected event is an ITS station, or is a geographical region
-- causeType		BOOLEAN,
-- whether the detected event is physically relevant to the received ITS stations (accident) or describing difficult driving conditions (fog on the road)
-- relevant	BOOLEAN,
-- whether a detected event is time critical (e.g., electronic braking light) or not (e.g. fog on the road)
--	timeCriticality	BOOLEAN,
--	...
--}

--STF405: The CAM definition is used instead, removed OPTIONAL, as it is syntactically incorrect
-- TaggedList ::= SEQUENCE
-- {
-- 	...
-- }

--STF405: replaced by imported type from CAM
--RefPosition ::= SEQUENCE {
--	situationLat	Latitude,  
--	situationLong	Longitude,  
--	situationAlt	Altitude,
--	accuracy	PositionAccuracy,	
--	speed	Speed	OPTIONAL,	
--	direction	Direction	OPTIONAL
--}

Altitude ::= INTEGER (-10000..16767215) 	-- multiples of 0.1 m

PositionAccuracy ::= OCTET STRING (SIZE(4))	

--STF405: removed Direction, as it is imported from CAM
--Direction ::= INTEGER{north(0), east(7200), south(14400), west(21600)} (0..28799)

--STF405: removed OPTIONAL, as it is syntactically incorrect
Speed ::= INTEGER (-32765..32765)	 -- multiples of 0.01 m/s 

--STF405: no need for explicit type
--LocationRef ::=	CHOICE {
	-- consequence position of the trace location referencing mechanism
--	trace	[0]	TraceLocData,
	-- more location referencing mechanism to be added
--	...
--}

TraceLocData ::=	SEQUENCE {
	--3 bits, identifier of the trace
	traceID	INTEGER(0 .. 7),	
	--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 	Altitude,
	ptAlt 	Elevation,
	...
	--STF405: removed repetition
}

END