The concept of Evolved Packet System (EPS) bearer in LTE exists for supporting end user data services. EPS bearer is defined between UE and Packet Data Network Gateway (P-GW) in the Evolved Packet Core (EPC).
E-UTRA Radio Bearer and E-UTRAN Access Bearer
From the diagram above , you can see EPS bearer is further sub-divided into an E-UTRA Radio bearer (between the eNodeB and UE over the radio interface) and E-UTRAN Access Bearer ( between eNodeB and SGW over the S1 – interface ) .
When it comes to providing multiplexed services on different EPS bearers. There is many to one mapping between End to End services and EPS Bearers.
There is one to one mapping between EPS Bearer , E-UTRAN Access Bearers and E-UTRAN Radio bearer.
Each E-UTRAN Access Bearer is associated with a GTP tunnel over S1 interface.
Each E-UTRAN Radio bearer over the radio air interface is associated with RLC instance. Radio bearers represent different priority queues over the radio interface.