5.2.7 CS domain, transfer of UESBI-Iu to RAN

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

5.2.7.1 MS Initiated Iu-cs Connection Establishment Procedure

FigureĀ 5.2.7.1-2: MS initiated call in UMTS

1) The UE establishes an RRC connection (assuming that one does not already exist for PS services).

2) The UE sends the first MM message (eg CM Service Request) to the MSC.

The MSC shall send the UESBI-Iu to the RNC.

The authentication procedure (if it is to be performed) can be done before or after sending the UESBI-Iu to the
RNC.

4) The Iu Security Mode command is performed.

If the RNC does not receive the UESBI-Iu information before the RANAP Security Mode Command then the RNC should assume that no UESBI-Iu information is available for this UE (for example, because the MSC does not support the PUESBINE Feature) (and unless the RNC has already received UESBI-Iu on an existing PS domain Iu connection).

5) The first CM layer message (eg Setup or Register) is sent by the UE to the MSC.

5.2.7.2 Network Initiated Iu-cs Connection Establishment

FigureĀ 5.2.7.2-2: Network initiated Iu-cs Interface connection establishment

1) The MSC receives some stimulus that causes it to page the RNC. The RNC then pages the mobile.

2) The UE establishes the RRC Connection (assuming that one does not already exist for PS services)

3) The UE sends the Paging Response message to the MSC.

  1. The MSC shall send the UESBI-Iu to the RNC.

The authentication procedure (if it is to be performed) can be done before or after sending the UESBI-Iu
information to the RNC.

5) The Iu Security mode command is performed.

If the RNC does not receive the UESBI-Iu information before the RANAP Security Mode Command then the RNC should assume that no UESBI-Iu information is available for this UE (for example, because the MSC does not support the PUESBINE Feature) (and unless the RNC has already received UESBI-Iu on an existing PS domain Iu connection).

6) Typically the first CM layer message (eg Setup or Register) is sent by the MSC to the UE.