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Cisco Prime Network 4.0 User Guide
OL-29343-01
Chapter 25 Monitoring Mobile Technologies
LTE Networks
Monitoring Evolved Packet Data Gateway (ePDG)
In today’s market, there are multiple access networks for mobile technologies. For example, the
following access networks are available for 3rd Generation Partnership Project (3GPP) network:
• General Packet Radio Service (GPRS). See GPRS/UMTS Networks, page 25-4.
• Global System for Mobile communication (GSM)
• Universal Mobile Telecommunication System (UMTS). See GPRS/UMTS Networks, page 25-4.
The following access network are available for Non-3GPP network:
• Worldwide Interoperability for Microwave Access (WiMAX)
• CDMA2000
• Wireless local area network (WLAN)
• Fixed networks
The Non-3GPP networks can be categorized into two—Trusted and Untrusted. While the trusted
non-3GPP networks can interact directly with the Evolved Packet Core (EPC), the untrusted networks
are required to pass through a security gateway to gain access to the EPC. This security gateway is called
the Evolved Packet Data Gateway or ePDG.
When a user transmits data to the EPC using an untrusted non-3GPP network access, the ePDG must act
as a termination node of IPSec tunnels established with the user equipment and secure the data being
sent. Figure 25-12 shows the ePDG architecture.
Figure 25-12 ePDG Architecture
eNodeB
Signaling Interface
Bearer Interface
S1-U S5
S2b
SGi
S1-MME
S11
MME
320496
S6a
Gx
S2a
Gxc
HSS
OFCS
SWx
SWm
SWu
AAA
E-UTRAN
Operator’s
IP Services
Untrusted non-3GPP
IP Access
wPDG
S-GW P-GW
PCRF
Tr usted non-3GPP
IP Access