Here I write in short about eNodeB functions, Mobile Management Entity (MME) functions and System Architecture Evolution (SAE) functions.

LTE – eNodeB functions

The eNodeB performs the following functions in LTE:

  • Radio Resource Management, Radio Bearer Control, Radio Admission Control,
  • Connection Mobility Control, Dynamic allocation of resources to LTE UEs in both Uplink and Downlink (scheduling)
  • IP header compression and encryption of user data stream
  • Selection of MME at LTE UE attachment
  • Routing User Plane data to LTE SAE Gateway
  • Scheduling and transmission of paging messages (originated from the MME)
  • Scheduling and transmission of broadcast information (originated from the MME or Operations, Administration and Maintenance (OAM)
  • Measurement and measurement reporting configuration for mobility and scheduling in LTE

LTE – Mobile Management Entity (MME) functions

The MME performs the following functions in LTE:

  • Distribution of paging messages to the LTE eNodeBs
  • Security control in LTE call
  • Idle state mobility control
  • SAE bearer control
  • Ciphering and integrity protection of NAS signaling

LTE – System Architecture Evolution (SAE) functions

The System Architecture EvolutionSAE Gateway performs the following functions for LTE:

  • Termination of LTE U-plane packets for paging reasons
  • Switching of U-plane for supporting UE mobility
  • QoS handling and tunnel management

This is only short work of eNodeB, Mobile Management Entity (MME) and System Architecture Evolution (SAE) which I already write in details in previous Topics.