Iu Signalling Link Management Support; Iuh User-Plane Transport Bearer Handling Support; Network Access Control Functions Through Segw - Cisco ASR 5000 Series 3G Home NodeB Administration Manual

▀ Features and Functionality - Base Software
 Reduces the need/frequency for inter-CN node RAUs. This substantially reduces signaling load and data transfer
delays.
 Supports load redistribution with the MSC/SGSN offloading procedure.
To incorporate the concept of multiple CN nodes, Iu-Flex introduces the concept of "pool-areas" which is enabled by
the routing mechanism in HNB GW. A pool-area is served by multiple CN nodes (MSCs or SGSNs) in parallel which
share the traffic of this area between each other. Furthermore, pool-areas may overlap. From a RAN perspective a pool-
area comprises all LA(s)/RA(s) of one or more RNC/BSC or HNBGW that are served by a certain group of CN nodes in
parallel. One or more of the CN nodes in this group may in addition serve LAs/RAs outside this pool-area or may also
serve other pool-areas. This group of CN nodes is also referred to as MSC pool or SGSN pool respectively.
The Iu-Flex enables a few different application scenarios with certain characteristics. The service provision by multiple
CN nodes within a pool-area enlarges the served area compared to the service area of one CN node. This results in
reduced inter CN node updates, handovers and relocations and it reduces the HLR/HSS update traffic. The configuration
of overlapping pool-areas allows to separate the overall traffic into different UE moving pattern, e.g. pool-areas where
each covers a separate residential area and all the same city centre. Other advantages of multiple CN nodes in a pool-
area are the possibility of capacity upgrades by additional CN nodes in the pool-area or the increased service availability
as other CN nodes may provide services in case one CN node in the pool-area fails.

Iu Signalling Link Management Support

Support for Iu signal link management function for HNB-GW in accordance with the following standards:
 3GPP TS 25.412 V8.0.0 (2008-12): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN Iu interface signalling transport (Release 8)
 3GPP TS 25.413 V7.9.0 (2008-06): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN Iu interface RANAP signalling (Release 7)
 3GPP TS 25.414 V9.0.0 (2009-12): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN Iu interface data transport and transport signalling (Release 9)
HNBGW supports RANAP protocol for management of IuPS/IuCS connections. The IU connection on the IuPS/IuCS
interface is realized using an SCCP connection towards SGSN/MSC. The SCCP could be over SIGTRAN or ATM.

IuH User-Plane Transport Bearer Handling Support

Support for transfer of CS as well as PS data over IP on the IuH interface:
 3GPP TS 25.467 V8.0.0. (2008-12): 3rd Generation Partnership Project; Technical Specification Group Radio
Access Network; UTRAN architecture for 3G Home NodeB; Stage 2 (Release 8)
HNB-GW supports GTP-U v1 for PS traffic transport and RTP/RTCP for CS traffic transport on IuH interface. HNB-
GW terminates the GTPU tunnels and RTP sessions at itself for each tunnel/session between CN and HNB.

Network Access Control Functions through SeGW

These functions enable secure user and device level authentication between the authenticator component of the HNB-
GW and a 3GPP HSS/AuC and RADIUS-based AAA interface support.
This section describes following features:
 Authentication and Key Agreement (AKA)
▄ Cisco ASR 5000 Series 3G Home NodeB Gateway Administration Guide
28
HNB Gateway in Wireless Network
OL-25069-03