Cisco ASR 5000 Series - Page 851

Mobility Management Entity Overview
Product Description ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22938-02
Figure 202. Architecture of LTE/SAE Network
Internet
Enterprise
e-NodeB
SGSN
HSS
MME
MME
P-GWS-GW
PCRF
S6a
S1-U
S10
S5/S8
S4
S3
S11
GERAN
SGi
S12
Gx
Gxc
E-UTRAN
Evolved Packet Core (EPC)
Another EPC
UTRAN
In accordance with 3GPP standard, the MME provides following functions and procedures in LTE/SAE network:
Non Access Strutum (NAS) signalling
NAS signalling security
Inter CN node signalling for mobility between 3GPP access networks (terminating S3)
UE Reachability in ECM-IDLE state (including control and execution of paging retransmission)
Tracking Area list management
PDN GW and Serving GW selection
MME selection for handover with MME change
SGSN selection for handover to 2G or 3G 3GPP access networks
Roaming (S6a towards home HSS)
Authentication
Bearer management functions including dedicated bearer establishment
Lawful Interception of signalling traffic
Warning message transfer function (including selection of appropriate eNodeB)
UE Reachability procedures
Interfaces with MSC for Voice paging
Interfaces with Gn/Gp SGSN for interconnecting to legacy network