Mobility Management Entity(MME) is a key component of the standards-defined Evolved Pack Core (EPC) for LTE. It provides mobility session management for the LTE network and supports subscriber authentication, roaming and handovers to other networks.
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Access Control
- Security
- Authentication
- GUTI allocation function
- User equipment identification
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Function
- AS security context distributed function
- Confidentiality and integrity protection of the NAS signaling
- 3G security parameters and EPC security context mapping function
- Admission control
- On the capacity of system
- On the CPU and Memory resource consumption
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Mobility Management Functions
- State model
- Attach
- Detach
- Handover
- TAU
- Tracking area management
- Tracking area update
- Paging and service request
- Purge UE
- Access Restriction function
- Multi-PDN connection
- ODB function
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Roaming Management
- Support CSFB function
- Session Management
- EPS bearer activation
- EPS bearer modification
- EPS bearer deactivation
- UE AMBR management
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Control selection of NE for the UE
- PDN GW selection
- Serving GW selection
- MME selection function
- SGSN selection function
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Interfaces comply to 3GPP R14:
- S1-MME: Between eNodeB and MME
- S6a: Between MME and HSS
- S13: Between EIR and MME
- S11: Between MME and SGW; transmit signal of Control Plate
- S10: Connect the MME Pool
- S3/Gn: Between MME and SGSN
- SGi: Between MME and MSC; handling the CSFB process
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