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25-46
Cisco Prime Network 4.0 User Guide
OL-29343-01
Chapter 25 Monitoring Mobile Technologies
LTE Networks
Working with Serving Gateway (S-GW)
In a Long Term Evolution (LTE) / Systems Architecture Evolution (SAE) network, a Serving Gateway
(S-GW) acts as a demarcation point between the Radio Access Network (RAN) and core network, and
manages user plane mobility. It serves as the mobility anchor when terminals move across areas served
by different eNode-B elements in Evolved UMTS Terrestrial Radio Access Network (E-UTRAN), as
well as across other 3GPP radio networks such as GSM EDGE Radio Access Network(GERAN) and
UTRAN. S-GW buffers downlink packets and initiates network-triggered service request procedures.
Other functions include lawful interception, packet routing and forwarding, transport level packet
marking in the uplink and the downlink, accounting support for per user, and inter-operator charging.
The S-GW routes and forwards user data packets, while also acting as the mobility anchor for the user
plane during inter-eNode-B handovers and as the anchor for mobility between LTE and other 3GPP
technologies.
For idle state user equipment (UE), the S-GW terminates the downlink data path and triggers paging
when downlink data arrives for the UE. It manages and stores UE contexts, such as parameters of the IP
bearer service, network internal routing information, and so on. It also performs replication of the user
traffic in case of lawful interception.
The following topics provide details on how to work with S-GWs in Prime Network Vision:
• Viewing S-GW Properties, page 25-46
• S-GW Commands, page 25-47
Viewing S-GW Properties
Prime Network Vision displays the S-GWs in a S-GW container under the Mobile node in the logical
inventory. The icon used for representing S-GW in the logical inventory is explained in Logical
Inventory Icons, page A-7.
To view S-GW properties:
Step 1 Right-click the required device in Prime Network Vision and choose Inventory.
Step 2 In the logical inventory window, choose Logical Inventory > Context > Mobile > S-GW Container.
Prime Network Vision displays the list of S-GW services configured under the container. You can view
the individual S-GW service details from the table on the right pane or by choosing Logical
Inventory >Context > Mobile > S-GW Container > S-GW.
Table 25-27 describes the details available for each S-GW.
Table 25-26 P-GW Commands
Command Navigation Description
Create P-GW PLMN Right-click on a
P-GW
service > Comm
ands > Configur
ation
Use this command to create a PLMN for
P-GW.
Delete P-GW Use this command to delete a P-GW.
Modify P-GW Use this command to modify the
configuration details for a P-GW.