8.27 Error Indication

25.4133GPPRelease 17TSUTRAN Iu interface Radio Access Network Application Part (RANAP) signalling

8.27.1 General

The Error Indication procedure is initiated by a node to report detected errors in one incoming message, provided they cannot be reported by an appropriate failure message.

If the error situation arises due to reception of a message utilising dedicated signalling, then the Error Indication procedure uses connection oriented signalling. Otherwise the procedure uses connectionless signalling.

8.27.2 Successful Operation

Figure 31: Error Indication procedure, CN originated. Successful operation.

Figure 32: Error Indication procedure, RNC originated. Successful operation.

When the conditions defined in clause 10 are fulfilled, the Error Indication procedure is initiated by an ERROR INDICATION message sent from the receiving node.

The ERROR INDICATION message shall contain at least either the Cause IE or the Criticality Diagnostics IE.

Examples for possible cause values for protocol error indications are:

– "Transfer Syntax Error"

– "Semantic Error"

– "Message not compatible with receiver state".

If the ERROR INDICATION message is sent connectionless, the CN Domain Indicator IE shall be present.

If the ERROR INDICATION message is sent connectionless towards the CN, the Global RNC-ID IE shall be present.

When an ERROR INDICATION message is sent connectionless from a CN node towards an RNC for which the sending CN node is not the default CN node, the Global CN-ID IE shall be included.

8.27.3 Abnormal Conditions

Not applicable.