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The 4G LTE Network contains the Access Network (E-UTRAN) and the Core Network (Evolved Packet Core (EPC)).
The Access Network contains the the eNBs.
and the core network contains the the MMEs, the SGWs, the PGWs, and the HSS.
the target of the LTE network is to make the UE able to send and receive user data to and from the PDN.

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