LTE - EPS Bearer Flow

The simple definition of EPS Bearer is process UE to get IP address (this is definition by me). What actually happen inside EPS bearer?

# The EPS Bearer #

UE ---- eNodeB
->1. Attach request
->Wireless interface

eNodeB ---- MME
->2. Attach request
->S1-MME interface (SCTP)

MME ---- SGW
->3. Create session request
->S11 interface (GTPv2-C)

SGW ---- PGW
->4. Create session request
->S5 interface (GTPv2-C)

PGW ---- SGW
->5. Create session response
->S5 interface (GTPv2-C)

SGW ---- MME
->6. Create session response
->S11 interface (GTPv2-C)

MME ---- eNodeB
->7. Attach accept
->S1-MME interface (SCTP)

eNodeB ---- UE
->8. Attach accept
->Wireless interface