MME stands for mobility management
entity. It is the key control node for LTE access network. It is responsible
for tracking and paging procedure including retransmissions and also for idle
mode of user equipment. It is also responsible for bearer activation and its
deactivation procedures. Its task also belongs choosing the serving gateway for
a UE in process of initial attach and when the intra handover take place which
involves core network relocation. It is responsible for authenticating user
towards the HSS (home service station), if user is roaming MME terminates
interface towards user home HSS. Its duty is also authorization UE to public
land mobile network and enforcing UE roaming restrictions if there are any. MME
is also termination point of ciphering and integerated protection for NAS
signaling.
Functions performed are:
1.
NAS
signaling
2.
NAS
signaling security
3.
Authentication
4.
Authorization
5.
UE
reach ability procedures
6.
Roaming
7.
SGSN
selection for handovers to 2G or 3G 3GPP
access networks
8.
Tracking
area list management
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