Cisco Cisco Packet Data Gateway (PDG)
HNB Gateway in Wireless Network
How HNB-GW Works ▀
HNB-GW Administration Guide, StarOS Release 18 ▄
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6. The HNB attempts to register the UE on the HNB-GW by transmitting the UE-REGISTER-REQUEST. The
message contains at a minimum:
UE Identity: IMSI of the (U)SIM associated with the UE and the indication about UE capabilities
provided in step 1.
Important:
The UE IMSI provided in the UE-REGISTER message is unauthenticated.
7. The HNB-GW checks UE capabilities and if these indicate that CSG is not supported the HNB-GW shall
perform access control for the particular UE attempting to utilize the specific HNB.
8. If the HNB-GW accepts the UE registration attempt it shall allocate a context-id for the UE and respond with a
UE-REGISTER-ACCEPT message, including the context-id, to the HNB. If the HNB-GW chooses to not
accept the incoming UE registration request then the HNB-GW shall respond with a UE-REGISTRATION-
REJECT message.
accept the incoming UE registration request then the HNB-GW shall respond with a UE-REGISTRATION-
REJECT message.
9. The HNB then sends a RUA (RANAP User Adaptation) CONNECT message containing the RANAP Initial UE
message to HNB-GW.
10. The reception of the RUA 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 to CN.
11. The CN response with a SCCP Connection Confirm message to HNB-GW.
12. The UE then continue with the NAS procedure (e.g. Location Updating procedure) towards the CN, via HNB
12. 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:
in core network:
Iu Connection Establishment Procedure
This procedure is applicable for establishment of IuH and IuPS/IuCS connection between HNB to HNB-GW and HNB-
GW to SGSN/MSC in core network.
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.