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LTE Architecture And Its Network Elements

LTE Architecture and its Network Elements

Below is the LTE architecture


Function of LTE Network Elements

The Function of the eNodeB

  • Radio resource management (RRM)
    • radio bearer control
    • mobility management
    • admission control
    • dynamic resource allocation
  • Routing of user plane packets towards the S-GW
  • MME selection
  • Packet compression and ciphering
  • Paging Message scheduling and transmission

The Function of the MME

  • Authentication
  • NAS Signaling
  • Mobility management
  • Paging procedure
  • Tracking area Update
  • Bearer activation and deactivation process
  • S-GW selection for a UE at the initial attach

The Function of the S-GW

  • The main function of the Serving Gateway is routing and forwarding of user data packets.
  • It is also responsible for inter-eNB handovers in the U-plane and provides mobility between LTE and other types of networks, such as between 2G/3G

The Function of the P-GW

  • UE IP allocation
  • IP Routing and forwarding
  • PCEF Function-responsible for dictating QoS and BW parameters for subscriber’s session.

The Function of the HSS

  • Permanent and central subscriber database
  • Contains center Authentication functionality 

The Function of the PCRF

  • PCRF a combination of the Charging Rules Function (CRF) and the Policy Decision Function (PDF), and ensures the service policy and sends Quality of Service (QoS) information for each session begin and accounting rule information.