IU-Common { }

-- Humble attempt of extracting the common part of RUA, HNBAP and RANAP out of
-- their respective ASN.1 syntax definitions.  Hidden in all those information
-- object classes is a quite classic 'message header' structure that is identical
-- to all of the messages of the above protocols.  Only the actual information element
-- contents is specified as 'real' ASN.1 complex data type.

DEFINITIONS AUTOMATIC TAGS ::=

BEGIN

maxProtocolExtensions	INTEGER ::= 65535
maxProtocolIEs		INTEGER ::= 65535

Criticality		::= ENUMERATED { reject, ignore, notify }

ProcedureCode		::= INTEGER (0..255)

ProtocolIE-ID		::= INTEGER (0..maxProtocolIEs)

MessageType ::= ENUMERATED { initiatingMessage, successfulOutcome, unsuccessfulOutcome }

ProtocolIEContainer ::= SEQUENCE (SIZE (0..maxProtocolIEs)) OF ProtocolIE-Field

ProtocolExtensionContainer ::= SEQUENCE (SIZE (1..maxProtocolExtensions)) OF ProtocolIE-Field

ProtocolIE-Field ::= SEQUENCE {
	id		ProtocolIE-ID,
	criticality	Criticality,
	value		ANY
}


IUCommon-PDU ::= SEQUENCE {
	choice			MessageType,
	procedureCode		ProcedureCode,
	criticality		Criticality,
	protocolIEs		ProtocolIEContainer,
	protocolExtensions	ProtocolExtensionContainer	OPTIONAL,
	...
}


END