8.34 Direct Information Transfer

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

8.34.1 General

The purpose of the Direct Information Transfer procedure is to transfer some information from the RNC to the CN or vice versa in unacknowledged mode.

This procedure uses connectionless signalling.

8.34.2 Successful Operation

8.34.2.1 Direct Information Transfer initiated from the RNC

Figure 42: Information Request procedure. Successful operation.

The procedure is initiated with a DIRECT INFORMATION TRANSFER message sent from the RNC to the CN.

The DIRECT INFORMATION TRANSFER message shall include the following IEs:

– Inter-system Information Transfer Type,

– Global RNC-ID,

– CN Domain Indicator,

The Inter-system Information Transfer Type IE indicates the nature of the transferred information.

When the transferred information is of RIM nature, the RIM Information IE within the RIM Transfer IE shall contain a BSSGP RIM PDU. The final RAN destination node where the RIM information needs to be routed by the CN shall be indicated in the RIM Routing Address IE within the RIM Transfer IE and shall include either the identity of a GSM cell to identify a target BSS, or the identity of a Tracking Area and an eNB to identify the target eNB.

8.34.2.1.1 Successful Operation for GERAN Iu mode

In the case of a Direct Information Transfer procedure initiated from GERAN Iu mode BSC, the final RAN destination node where the RIM information needs to be routed by the CN shall be indicated in the RIM Routing Address IE within the RIM Transfer IE and may include the identity of either a GSM cell to identify a target BSS or the Target RNC-ID IE including the RAC IE to identify a target RNC.

8.34.2.2 Direct Information Transfer initiated from the CN

Figure 43: Information Request procedure. Successful operation.

The procedure is initiated with a DIRECT INFORMATION TRANSFER message sent from the CN to the RNC.

The DIRECT INFORMATION TRANSFER message shall include the following IEs:

– Inter-system Information Transfer Type,

– CN Domain Indicator,

The DIRECT INFORMATION TRANSFER message may include the following IEs:

– Global CN-ID.

The Global CN-ID IE shall be included only when the CN node sending the message is not the default CN node of the RNC.

The Inter-system Information Transfer Type IE indicates the nature of the transferred information.

When the transferred information is of RIM nature, the RIM Information IE within the RIM Transfer IE shall contain a BSSGP RIM PDU. The RIM Routing Address IE shall not be present since the RNC is the final destination node.

8.34.3 Abnormal Conditions

Not applicable.