LTE E-UTRAN FUNCTIONS AND ARCHITECTURE

E-UTRAN ARCHITECTURE

The E-UTRAN consists of eNBs:-

• Providing the E-UTRA user plane (PDCP/RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE. 
• The eNBs are interconnected with each other by means of the X2 interface. 
• The eNBs are also connected by means of the S1 interface to the EPC (Evolved Packet Core),
• The MME (Mobility Management Entity) by means of the S1-MME and to the Serving Gateway (S-GW) by means of the S1-U. 
• The S1 interface supports a many-to-many relation between MMEs / Serving Gateways and eNBs. 

The eNB  functions: - 

• Radio Resource Management
• Radio Bearer Control,
• Radio Admission Control,
• Connection Mobility Control,
• Dynamic allocation of resources to UEs in both uplink and downlink (scheduling);
• Routing of User Plane data towards Serving Gateway;
• Measurement
• reporting configuration 

3GPP references- TS 36.300 version 9.6.0 Release 9

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