Security Gateway (Segw); Henb Gateway (Henb-Gw) - Cisco ASR 5x00 Home eNodeB Administration Manual

▀ Product Description
 e-RAB management functions
 Radio resource management functions
 GTP-U tunnels management
 Mobility management functions
 Security functions
 Service and Network access functions
 Paging co-ordination functions
 UE registration for HeNB
 User-plane management functions including ciphering
Apart from the above listed basic functionalities, the HeNB is also involved in Mobility Management Entity (MME)
selection when no routing to an MME can be determined from the information provided by the UE. HeNB enforces the
UL (uplink) bearer level rate based on UE-AMBR and MBR via means of uplink scheduling; and does DL (downlink)
bearer level rate enforcement based on UE-AMBR (aggregate maximum bit rate).

Security Gateway (SeGW)

The Security Gateway is an logical function on HeNB-GW in the LTE femtocell network deployment, however it is
specified as a requirement in the Femtocell LTE network architecture. It may be implemented either as a separate
physical entity or co-located with an existing entity. The SeGW secures the communication from/to the HeNBs.
Basic function of this entity are:
 Authentication of HeNBs
 Termination of encrypted IPsec data connection from the femtocells
 Providing access to HeMS and HeNB-GW
The SeGW holds capability of implementing a Denial of Service (DoS) shield to protect the EPC (S-GW and MME) by
detecting and then filtering out the attack traffic while maintaining the QoS (Quality of Service) of useful traffic. In our
implementation, it is an optional element which is situated on HeNB-GW.

HeNB Gateway (HeNB-GW)

The HeNB-GW provides the access to Femto user to LTE core network. It acts as an access gateway to HeNB and
concentrates connections from a large amount of HeNBs. HeNB-GW serves as a control plane (C-Plane) concentrator,s
pecifically the S1-MME interface.
The HeNB-GW may optionally terminate the user plane towards the HeNB and towards the S-GW, and may provide a
relay function for relaying User Plane data between the HeNB and the S-GW. The HeNB-GW supports NAS Node
Selection Function (NNSF).
Important:
towards the EPC from any one HeNB.
▄ Cisco ASR 5x00 Home eNodeB Gateway Administration Guide
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NAS Node Selection Function (NNSF)supports S1-Flex or multiple S1-MME connections
HeNB Gateway in Wireless LTE Network