Cisco ASR 5000 Series 3G Home NodeB Administration Manual page 45

HNB Gateway in Wireless Network
Figure 7. Iu Connection Establishment Call Flow
1. Upon receiving of UE-REGISTER-ACCEPT message from HNB-GW, the HNB then sends a RUA CONNECT
message to HNB-GW containing the RANAP Initial UE message.
2. The reception of the RUA CONNECT message at the HNB-GW triggers the setup of SCCP connection by the
HNB-GW towards the CN (SGSN/MSC). HNB-GW forwards the Initial UE Message.
3. The CN responses with a SCCP Connection Confirm message.
4. The UE then continue with the authentication and security procedures towards the CN, via HNB and the HNB-
GW.
5. The SGSN/MSC performs Direct Transfer procedure with HNB-GW and sends SCCP-DATA-FORM1 REQ to
HNB-GW.
OL-25069-03
Cisco ASR 5000 Series 3G Home NodeB Gateway Administration Guide ▄
How HNB-GW Works ▀
45