Cisco ASR 5000 Series 3G Home NodeB Administration Manual page 47

HNB Gateway in Wireless Network
Figure 8. Network Initiated Iu Connection Release Call Flow
1. User session is established between UE and CN via HNB and HNB-GW over Iu interface and CN (SGSN/MSC)
starts RANAP Iu Release procedure with HNB-GW and sends SCCP-DATA-FORM1 REQ with RANAP Iu
Release command to HNB-GW.
2. The HNB-GW uses the information received in SCCP-DATA-FORM1 REQ with RANAP Iu Release procedure
from CN and forwards the same to HNB through RUA-DIRECT-TRANSFER message with RANAP Iu
Release command.
3. On reception of RANAP Iu Release command in RUA-DIRECT-TRANSFER message the HNB triggers the
RCC Connection Release procedure and responds to HNB-GW with RANAP Iu Release Complete command
in RUA-DISCONNECT Response message.
4. On reception of successful RANAP Iu Release Complete command in RUA-DISCONNECT Response message
from HNB, the HNB-GW sends RANAP Iu Release Complete command in SCCP-DATA-FORM1 Response
message to CN (SGSN/MSC).
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Cisco ASR 5000 Series 3G Home NodeB Gateway Administration Guide ▄
How HNB-GW Works ▀
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