5.8 HNB Configuration Transfer

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

The HNB Configuration Transfer function provides the means to inform the HNB-GW to provide HNBs with address information of neighbour HNBs in order to enable the establishment of Iurh connection. The neighbour list is maintained in the HNB via interaction with the HMS. The HNB uses the IP addresses received from the HNB-GW to connect to neighbour HNBs over Iurh. If the requested HNB supports S-RNTI prefix assignment, the HNB-GW shall, if supported, also inform the HNB of the S-RNTI prefix values of the neighbour HNBs supporting CELL_FACH mobility along with their IP address information. If URAs are indicated at registration by the HNB, the HNB-GW may respond with the list of HNBs belonging to those URAs along with their S-RNTI prefixes and IP address information.

The procedure for HNB Configuration Transfer is shown in Figure 5.8-1.

Figure 5.8-1: HNB Configuration Transfer.

0. HNB₁ has already switched to operational mode, has registered at the HNB-GW and is connected to HNBs within its reach.

1. HNB₂ switches to operational mode.

2. HNB₂ registers at the HNB-GW successfully and provides its IP address for direct Iurh connectivity.

3. HNB₁ identifies a change in its neighbour list, from e.g. detecting HNB₂ or via HMS.

4. HNB₁ requests the IP addresses of the Target HNB(s) by sending HNBAP HNB Configuration Transfer Request to the HNB-GW.

5. The HNB-GW responds with a HNB Configuration Transfer Response message to the source HNB providing for each neighbour HNB requested

– either Iurh signalling TNL IP address information indicating the IP address to which the HNB shall setup an Iurh signalling connection and other information

– or a reason why respective information cannot be provided.

6. The HNB₁ sets up an Iurh connection towards HNB₂. If direct Iurh connectivity is applied, HNB₁ has to establish a reliable transport session before issuing the RNA:Iurh Setup procedure.

If the HNB-GW includes a list of Iurh signalling TNL addresses in the HNBAP HNB: CONFIGURATION TRANSFER RESPONSE message, the HNB establishes Iurh connection using the addresses provided in an ordered manner starting with the first entry of the list.