Cisco Cisco Packet Data Gateway (PDG)
SaMOG Gateway Overview
Network Deployment and Interfaces ▀
SaMOG Administration Guide, StarOS Release 16 ▄
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Figure 3. SaMOG Gateway in the EPC Network
Network Elements
This section provides a description of the network elements that work with the SaMOG Gateway in the E-UTRAN/EPC
network.
network.
eNodeB
The evolved Node B (eNodeB) is the termination point for all radio-related protocols. As a network, E-UTRAN is
simply a mesh of eNodeBs connected to neighboring eNodeBs via the X2 interface.
simply a mesh of eNodeBs connected to neighboring eNodeBs via the X2 interface.
MME
The Mobility Management Entity (MME) is the key control node for the LTE access network. It works in conjunction
with the eNodeB and the S-GW to control bearer activation and deactivation. The MME is typically responsible for
selecting the P-GW for the UEs to access the PDN, but for access from trusted non-3GPP IP access networks, the
SaMOG Gateway’s MRME service is responsible for selecting the P-GW.
with the eNodeB and the S-GW to control bearer activation and deactivation. The MME is typically responsible for
selecting the P-GW for the UEs to access the PDN, but for access from trusted non-3GPP IP access networks, the
SaMOG Gateway’s MRME service is responsible for selecting the P-GW.
S-GW
The Serving Gateway (S-GW) routes and forwards data packets from the 3GPP UEs and acts as the mobility anchor
during inter-eNodeB handovers. The S-GW receives signals from the MME that control the data traffic. All 3GPP UEs
accessing the EPC network are associated with a single S-GW.
during inter-eNodeB handovers. The S-GW receives signals from the MME that control the data traffic. All 3GPP UEs
accessing the EPC network are associated with a single S-GW.