Cisco Cisco Packet Data Interworking Function (PDIF)
HNB Gateway in Wireless Network
How HNB-GW Works ▀
HNB-GW Administration Guide, StarOS Release 16 ▄
53
Network Initiated Iu Connection Release Procedure
This procedure is applicable for release of IuH and IuPS/IuCS connection between HNB to HNB-GW and HNB-GW to
SGSN/MSC in core network.
SGSN/MSC in core network.
The following figure and the text that follows describe the message flow for an Iu connection release procedure initiated
by CN (SGSN/MSC).
by CN (SGSN/MSC).
Figure 10. 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.
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.
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.
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).
message to CN (SGSN/MSC).