Cisco ASR 5000 Series Product Overview Download

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Mobility Management Entity Overview

▀ Network Deployment and Interfaces

▄ Cisco ASR 5000 Series Product Overview

OL-22938-02

S1-MME Interface

: This interface is the reference point for the control plane protocol between eNodeB and

MME. S1-MME uses S1- Application Protocol (S1-AP) over Stream Control Transmission Protocol (SCTP) as
the transport layer protocol for guaranteed delivery of signaling messages between MME and eNodeB (S1).

This is the interface used by the MME to communicate with eNodeBs on the same LTE Public Land Mobile
Network (PLMN). This interface serves as path for establishing and maintaining subscriber UE contexts.

One or more S1-MME interfaces can be configured per system context.

S3 Interface

: This is the interface used by the MME to communicate with SGSNs on the same Public PLMN for

interworking between GPRS/UMTS and LTE network access technology. This interface serves as both the
signalling and data path for establishing and maintaining subscriber UE contexts.

The MME communicates with SGSNs on the PLMN using the GPRS Tunnelling Protocol (GTP). The
signalling 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

: This is the interface used by the MME to communicate with the Home Subscriber Server (HSS).

The HSS is responsible for transfer of subscription and authentication data for authenticating/authorizing user
access and UE context authentication. The MME communicates with the HSSs on the PLMN using Diameter
protocol.

One or more S6a interfaces can be configured per system context.

S10 Interface

: This is the interface used by the MME to communicate with MME in same PLMN or on different

PLMNs. This interface is also used for MME relocation and MME to MME information transfer or handoff.

One or more S10 interfaces can be configured per system context.

Note: This interface will be supported in future release.

S11 Interface

: This interface provides communication between MME and Serving Gateways (SGW) for

information transfer using GTPv2 protocol.

One or more S11 interfaces can be configured per system context.

S13 Interface

: This interface provides communication between MME and Equipment Identity Register (EIR).

This interface is not supported in this release.

One or more S13 interfaces can be configured per system context.

Note: This interface will be supported in furture release.

S101 Interface

: This interface provides communication between MME and High Rate Packet Data (HRPD)

access node in a 3GPP2 network. It uses an application layer protocol S101-AP to enable interactions between
Evolved Packet System (EPS) and HRPD access node to allow for pre-registration and handover signalling
with the target system. The S101 interface supports procedures for pre-registration, session maintenance, and
active handoffs between E-UTRAN and HRPD networks.

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