Mobility Management Entity Overview
▄ Cisco ASR 5000 Series Product Overview
Product Description
This section describes the MME network function and its postion in LTE network.
The MME is the key control-node for the LTE access-network. It works in conjunction with Evolved NodeB (eNodeB),
Serving Gateway (S-GW) within the Evolved Packet Core (EPC) or LTE/SAE core network to perform the following
functions:
Involved in the bearer activation/deactivation process and is also responsible for choosing the S-GW and for a
UE at the initial attach and at time of intra-LTE handover involving Core Network (CN) node relocation
Provide PDN Gateway (P-GW) selection for subscriber to connect to PDN.
Provide idle mode UE tracking and paging procedure including retransmissions
Responsible for authenticating the user (by interacting with the HSS)
Work as termination point for the Non-Access Stratum (NAS) signaling
Responsible for generation and allocation of temporary identities to UEs
It checks the authorization of the UE to camp on the service provider‘s Public Land Mobile Network (PLMN)
and enforces UE roaming restrictions.
The MME is the termination point in the network for ciphering/integrity protection for NAS signaling and
handles the security key management.
Besides above mentioned functions the Lawful interception of signaling is also supported by the MME. The MME also
provides the control plane function for mobility between LTE and 2G/3G access networks with the S3 interface
terminating at the MME from the SGSN. The MME also terminates the S6a interface towards the home HSS for
roaming UEs.
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