The MME Function
- NAS signalling
- NAS signalling security
- AS Security control
- Inter CN node signalling for mobility between 3GPP access networks
- Idle mode UE Reachability (including control and execution of paging retransmission)
- Tracking Area list management (for UE in idle and active mode)
- PDN GW and Serving GW selection
- MME selection for handovers with MME change
- SGSN selection for handovers to 2G or 3G 3GPP access networks
- Roaming
- Authentication
- Bearer management functions including dedicated bearer establishment
- Support for PWS (which includes ETWS and CMAS) message transmission.
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