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Cisco Prime Network 4.0 User Guide
OL-29343-01
Chapter 25 Monitoring Mobile Technologies
Monitoring the Mobility Management Entity
• S1-MME Interface—The interface used by MME to communicate with eNodeBs on the same
PLMN. This interface is the reference point for the control plane protocol between eNodeB and
MME, this interface uses the S1 Application Protocol (SI-AP) instead of the Stream Control
Transmission Protocol (SCTP) as the transport layer protocol for guaranteed delivery of signaling
messages between MME and eNodeB. It serves as a path for establishing and maintaining subscriber
UE contexts and supports IPv4, IPv6, IPSec, and multi-homing.
• S3 Interface—The interface used by MME to communicate with S4-SGSNs on the same PLMN for
interworking between GPRS/UMTS and LTE network technologies. This interface serves as a
signaling path for establishing and maintaining subscriber UE contexts. The MME communicates
with SGSNs on the PLMN using the GPRS Tunneling Protocol (GTP). The signaling or control
aspect of this protocol is referred to as the GTP Control Plane (GTPC) while the encapsulated user
data traffic is referred to as the GTP User Plane (GTPU). One or more S3 interfaces can be
configured per system context.
• S6a Interface—The interface used by MME to communicate with Home Subscriber Server (HSS)
on PLMN using the diameter protocol. This interface is responsible for transfer of subscription and
authenticating or authorizing user access and UE context.
• S10 Interface—The interface used by the MME to communicate with another MME on the same or
a different PLMN using the GTPv2 protocol. This interface is also used for MME relocation and
MME-to-MME information transfer or handoff
• S11 Interface—The interface used by the MME to communicate with Serving Gateways (S-GW) for
transfer of information, using the GTPv2 protocol.
• S13 Interface—The interface used by the MME to communicate with the Equipment Identity
Register (EIR).
• SGs Interface—The interface used to connect the databases in the VLR and MME to support circuit
switch fallback scenarios.
• Sv Interface—The interface used by the MME to connect to the Mobile Switching Center to support
exchange of messages during a handover procedure for the Single Radio Voice Call Continuity
(SRVCC) feature.
• Gn Interface—The interface used to facilitate user mobility between 2G and 3G 3GPP networks.
This interface is used for intra-PLMN handovers.
• SLg Interface—The interface used by MME to communicate with the Gateway Mobile Location
Ceter (GMLC) using the diameter protocol. This interface is used for the Location Services (LCS),
which enables the system to determine and report location information of the connected UEs.
Viewing the MME Configuration Details
To view the MME configuration details:
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 > MME. The list of
MME services configured in Prime Network is displayed in the content pane.
Step 3 From the MME node, choose an MME service. The MME service details are displayed in the content
pane as shown in Figure 25-20.