Monday, September 14, 2009

EPS - Network architecture

This is simplified network architecture for EPS (Evolved Packet System)

There are two main parts of EPS: LTE (Long Term Evolution) and SAE (System Architecture Evolution).

Actually those two parts have also different names and LTE is known as E-UTRAN and SAE is known as EPC (Evolved Packet Core).

MME - Mobility Management Entity
S-GW - Serving Gateway
HSS - Home Subscriber Server
PCRF - Policy Control and Charging Rules Function
PDN-GW - Packet Data Networks Gateway

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