5.5 Iuh Disconnect

25.4673GPPRelease 17Stage 2TSUTRAN architecture for 3G Home Node B (HNB)

5.5.1 General

The following section illustrates the scenario where an UE-associated signalling connection is released across the Iuh. In this scenario the HNB is responsible for initiating the release of the UE-associated signalling connection via the RUA disconnect message. The HNB-GW is then responsible for co-ordinating the release of the UE-associated Iuh signalling connection with the corresponding Iu connection, which is triggered by the CN.

5.5.2 Iuh Disconnect procedure

Figure 5.5.2-1: Iuh Disconnect procedure.

1. Establish connection between UE and network. The related procedure is described in subclause 5.1.

2. CN sends a RANAP Release Iu connection command message to the HNB-GW.

3. HNB-GW forwards this message to the relevant HNB.

4. HNB triggers the release of the RRC connection to the UE. In this case a single Iu connection had been established for the UE.

5. HNB sends a Disconnect message to the HNB-GW to indicate that this is the end of this particular UE-associated signalling connection and includes the RANAP Release Iu Connection Complete message.

6. HNB-GW forwards the RANAP message onto the CN.

7. CN triggers the release of the associated SCCP connection.

8. HNB-GW confirms that the SCCP connection is released.

9. Optionally the HNB can de-register the UE context from the HNB-GW.