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LTE Architecture

E-UTRAN is the access network which provides support for the data services
EPC controls session establishment and security for user data. It then routes
the packet data to the appropriate network.
IMS supports the IP based multimedia services
MME - Mobility Management Entity
PCRF - Policy and Charging Rules Function
PDN Gateway - Packet Data Network Gateway
HSS - Home Subscriber Server - Home location register and the Authentication
Centre
CSCF - Call Session Control Function
P - Proxy
I - Interrogating
S - Serving
MGCF - Media Gateway Control Function - in charge of signalling over the
PSTN
MGW - Media Gateway - conversion of VoIP data to 64kbps PCM for PSTN
telephony network.