The MME Function

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  • 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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