5.2.11 Inter-MSC handover Iu mode to A/Gb-mode

23.1953GPPProvision of User Equipment Specific Behaviour Information (UESBI) to network entitiesRelease 5TS

In the Basic inter-MSC handover procedure (Iu mode to A/Gb mode) described in 3GPP TS 23.009 [5], UESBI-Iu shall be transferred from MSC-A to MSC-B. This is because UESBI-Iu may be needed in the case that there is a later handover from A/Gb mode to Iu mode under MSC-B.

The Inter-MSC Handover Iu mode to A/Gb mode is illustrated in FigureĀ 5.2.11-1 (copied from 3GPP TS 23.009 [5]).

Figure 5.2.11-1 Iu mode to A/Gb mode inter-MSC handover

Iu mode to A/Gb mode handover is initiated as described in 3GPP TS 23.009 [5].

1 The UESBI-Iu is NOT sent by RNS-A to 3G_MSC-A.

2 3G_MSC-A derives the UESBI-Iu from the IMEISV. The UESBI-Iu shall be sent by 3G_MSC-A to MSC-B in the MAP_Prepare_Handover request message.

If MSC-B did not receive the UESBI-Iu (for example because 3G_MSC-A does not support the PUESBINE Feature) then MSC-B shall ignore this fact.

3 MSC-B shall store the UESBI-Iu in case it is needed for a later A/Gb mode to Iu mode intra MSC-B handover.

The rest of the steps are as described in 3GPP TS 23.009 [5].

For Subsequent Inter-MSC handover, MSC-A shall transfer the UESBI-Iu to MSC-B’.