Cisco ASR 5x00 Home eNodeB Administration Manual page 12

▀ Product Description
The HeNB-GW may optionally terminate the user plane towards the HeNB and towards the S-GW, and provide a relay
function for relaying User Plane data between the HeNB and the S-GW.
Protocol Stacks for S1 Control Plane
The two figures below show the S1-MME protocol stacks with and without the HeNB-GW. When the HeNB-GW is not
present, all the S1 procedures are terminated at the HeNB and the MME.
Figure 3. Control plane for S1-MME Interface for HeNB to MME without the HeNB-GW
The HeNB-GW terminates the non-UE-dedicated procedures: both with the HeNB, and with the MME. The HeNB-GW
provides a relay function for relaying Control Plane data between the HeNB and the MME. The scope of any protocol
function associated to a non-UE-dedicated procedure lies between HeNB and HeNB-GW, and/or between HeNB-GW
and MME.
▄ Cisco ASR 5x00 Home eNodeB Gateway Administration Guide
12
HeNB Gateway in Wireless LTE Network