WHAT IS THE COMPOSITION OF E-UTRAN?

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Evolved Universal Terrestrial Radio Access Network (E-UTRAN) or RAN side (LTE side) consists of eNode B nodes. eNodeB nodes are are connected to each other via the X2 interface. Both the S1 and the X2 interface can be divided into control plane and user plane 

Concept of E-UTRAN

The S1 and X2 are multi-to- multi capable interfaces meaning that one eNode B can be connected to multiple MMEs , S-GW and other e-Node Bs.

However a UE can only be connected to one eNodeB , MME and S-GW at a given moment. Two terminals connected to the same eNodeBs can be connected to difference SGWs and vice versa.

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