Multiple Msc Selection Without Iu-Flex; Intra-Domain Multiple Cn Support Through Iu-Flex - Cisco ASR 5000 Series 3G Home NodeB Administration Manual

HNB Gateway in Wireless Network
 3GPP TS 25.469 V8.1.0 (2009-03): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN Iuh interface Home Node B Application Part (HNBAP) signalling (Release 8)
 IETF RFC 4960, Stream Control Transmission Protocol, December 2007
The HNB-GW provides HNB registration and de-registration procedure to register the HNB with the HNB-GW. This
procedure enables the HNB-GW to provide service and core network connectivity for the HNB. On HNB-GW node this
procedure is the first HNBAP procedure triggered after the SCTP association has become operational between HNB and
HNB-GW.
HNB management function processes the HNB/UE access control procedure through White-List processing on HNB-
GW node. Dynamic update of White-List gives the dynamic HNB management ability to HNB-GW.

Multiple MSC Selection without Iu-Flex

Support for multiple MSC selection in a CS core network is provided with this feature support.
HNBGW can connect to multiple MSC and SGSN through Iu-Flex or LAC mapping. This feature implements the
multiple MSC selection using LAC.
For this support the HNB-GW uses HNB's LAC, received during registration procedure in
HNB_REGISTER_REQUEST message, to distribute RANAP-Initial UE message to an MSC. It maps the LAC with
MSC point code and a set of LACs configured for each MSC, connected to the HNB-GW.
In the HNBGW, to select an MSC based on the LAC the following algorithm is used:
 If both Iu-Flex and LACs are configured for a MSC, then Iu-Flex is used to select a MSC.
 If only Iu-Flex is configured then Iu-Flex is used for selecting MSC.
 If only LACs are configured then MSC is selected using LAC from HNB.
 If both Iu-Flex and LACs are not configured in the HNBGW, it selects default MSC.

Intra-Domain Multiple CN Support Through Iu-Flex

Iu-Flex is the routing functionality for intra domain connection of HNB-GW nodes to multiple CN nodes (MSC/SGSN).
It provides a routing mechanism and related functionality on HNB-GW to enable it to route information of different
Core Network (CN) nodes with in the CS or PS domain. It is implemented in accordance with the following standards:
 3GPP TS 23.236 V9.0.0 (2009-12): 3rd Generation Partnership Project; Technical Specification Group Services
and System Aspects; Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core
Network (CN) nodes (Release 9)
 3GPP TS 25.468 V9.2.0 (2010-06): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN Iuh Interface RANAP User Adaptation (RUA) signalling (Release 9)
HNBGW supports Iu-Flex routing mechanism and other applications like many-to-many relation and load-sharing
between CN nodes with HNB-GW and CN node pooling. This mechanism provides following benefits to network
operator:
 Eliminates the single point of failure between an RNC/HNB-GW and a CN Node.
 Ensures geographical redundancy, as a pool can be distributed across sites.
 Minimizes subscriber impact during service, maintenance, or node additions or replacements.
 Increases overall capacity via load sharing across the MSCs/SGSNs in a pool.
OL-25069-03
Cisco ASR 5000 Series 3G Home NodeB Gateway Administration Guide ▄
Features and Functionality - Base Software ▀
27