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Content for  TS 38.413  Word version:  18.2.0

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9  Elements for NGAP Communicationp. 136

9.0  Generalp. 136

Subclauses 9.2 and 9.3 present the NGAP message and IE definitions in tabular format. The corresponding ASN.1 definition is presented in subclause 9.4. In case there is contradiction between the tabular format and the ASN.1 definition, the ASN.1 shall take precedence, except for the definition of conditions for the presence of conditional IEs, where the tabular format shall take precedence.
The messages have been defined in accordance to the guidelines specified in TR 25.921.
When specifying IEs which are to be represented by bitstrings, if not otherwise specifically stated in the semantics description of the concerned IE or elsewhere, the following principle applies with regards to the ordering of bits:
  • The first bit (leftmost bit) contains the most significant bit (MSB);
  • The last bit (rightmost bit) contains the least significant bit (LSB);
  • When importing bitstrings from other specifications, the first bit of the bitstring contains the first bit of the concerned information;
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9.1  Tabular Format Contentsp. 136

9.1.1  Presencep. 136

All IEs are marked mandatory, optional or conditional according to Table 9.1.1-1.
Abbreviation Meaning
MIEs marked as Mandatory (M) shall always be included in the message.
OIEs marked as Optional (O) may or may not be included in the message.
CIEs marked as Conditional (C) shall be included in a message only if the condition is satisfied. Otherwise the IE shall not be included.
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9.1.2  Criticalityp. 136

Each IE or group of IEs may have criticality information applied to it according to Table 9.1.2-1.
Abbreviation Meaning
No criticality information is applied explicitly.
YESCriticality information is applied. This is usable only for non-repeatable IEs.
GLOBALThe IE and all its repetitions together have one common criticality information. This is usable only for repeatable IEs.
EACHEach repetition of the IE has its own criticality information. It is not allowed to assign different criticality values to the repetitions. This is usable only for repeatable IEs.
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9.1.3  Rangep. 136

The Range column indicates the allowed number of copies of repetitive IEs/IE groups.

9.1.4  Assigned Criticalityp. 137

The Assigned Criticality column provides the actual criticality information as defined in subclause 10.3.2, if applicable.

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