telecom • networking • design

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LTE EPS Architecture Overview

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Excellent video describing the Evolved Packet Core used in LTE networks. The video describes the roles played by the major LTE components:

  • eNodeB
  • MME
  • S-GW
  • P-GW
  • HSS
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LTE security: encryption and integrity protection call flow

LTE key hierarchy

LTE security is based on a shared secret key K between the USIM and the HSS. The UE, the eNodeB and the MME derive keys for encryption and integrity protection from K.

The derived keys are used for:

  • NAS encryption and integrity protection
  • RRC encryption and integrity protection
  • User plane encryption

The key derivation and the key exchange call flow is described in the following link:

LTE security procedure: authentication, encryption and integrity protection