Iu Connection Procedures; Iu Connection Establishment Procedure - Cisco ASR 5000 Series Administration Manual

HNB Gateway in UMTS Network
Context id exists for the UE, the HNB initiates UE registration towards HNB-GW (step 4-6). If the HNB has a
context id for the UE neither UE registration procedure is performed nor the Identification procedure is
triggered.
4. The HNB attempts to register the UE on the HNB-GW by transmitting the UE-REGISTER-REQUEST. The
message contains at a minimum:
5. The HNB-GW checks UE capabilities and if these indicate that CSG is supported the HNB-GW shall accept the
UE registration and allocate a context-id for the UE.
6. HNB-GW respond with a UE-REGISTER-ACCEPT message back to the HNB including a context-id allocated
to the UE.
7. The HNB then sends a CONNECT message containing the RANAP Initial UE message.
8. The reception of the CONNECT message at the HNB-GW triggers the setup of SCCP connection by the HNB-
GW towards the CN. HNB-GW forwards the Initial UE Message and the CSG id of HNB.
9. The CN response with a SCCP Connection Confirm message.
10. The CN may optionally perform Mobility Management procedures, e.g. Authentication procedure.
11. The CN performs access control of UE.
12. After granted access the UE then continue with the NAS procedure (e.g. Location Updating procedure) towards
the CN, via HNB and the HNB-GW.

Iu Connection Procedures

This section describes call flow for Iu connection procedures on HNB-GW.
Following procedure call flows are described for Iu connection procedures between HNB, HNB-GW, and SGSN/MSC
in core network:

Iu Connection Establishment Procedure

Network Initiated Iu Connection Release Procedure
Iu Connection Establishment Procedure
This procedure is applicable for establishment of Iuh and Iu-PS/CS connection between HNB to HNB-GW and HNB-
GW to SGSN/MSC in core network.
The following figure and the text that follows describe the message flow for an Iu connection establishment procedure.
OL-22991-01
UE Identity: IMSI of the (U)SIM associated with the UE and the indication about UE capabilities
provided in step 1.
I :
MPORTANT
The UE IMSI provided in the UE-REGISTER message is unauthenticated.
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