Introduction to evolved packet core

This white paper provides a brief introduction to evolved packet core (EPC) — a new mobile core for LTE.

Herein, key concepts and functional elements-EPC gateways (Serving Gateway and Public Data Network Gateway), Mobility Management Entity (MME) and Policy and Charging Rules Function (PCRF)-are outlined, as well as key changes in LTE requirements imposed on the Evolved Packet Core, and the deployment challenges.