User's Manual

Small Cells System Architecture
Overview
The Alcatel-Lucent Small Cell unit uses 3GPP interfaces to connect to neighboring
eNodeBs and other existing mobile core network nodes, while offering a 3GPP-compliant
air interface. The architecture integrates seamlessly into existing LTE and UMTS
networks, including interfaces to other components, as well as to existing management
systems, and therefore integrates with existing applications, portals, and services through
standard interfaces.
The Small Cell unit interconnects with the core network elements with the addition of a
Security Gateway (SeGW), a 3G Small Cell GW (HNB-GW) and optionally a HeNB-GW
between the unit and the 3G/LTE core elements.
It supports S1-MME and S1-U interfaces based on 3GPP specifications as per macro
eNodeB. The unit has connectivity to all MMEs/SGWs (located in the core network) in
the pool/serving area. The S1-flex function and requirements for the unit differ from those
for the macro eNodeB, as it is on the HeNB-GW, instead of on the unit itself.
The Serving Gateway (SGW) selection function selects an available SGW to serve a UE.
The SGW selection function is performed by the MME and does not require any changes
to support the unit.
Figure 1-2 Small Cell Solution Architecture
Alcatel-Lucent 9962 Multi-standard Enterprise Cell v1 :
Overview
Small Cells System Architecture
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Alcatel-Lucent 9962 MSEC v1.0
3MN-02001-0003-DEZZA
Issue 3 November 2015