LTE User Plane - Protocol Stacks

UE - P GW user plane with E-UTRAN

- GPRS Tunnelling Protocol for the user plane (GTP U): This protocol tunnels user data between eNodeB and the S GW as well as between the S GW and the P GW in the backbone network. GTP shall encapsulate all end user IP packets.
- MME controls the user plane tunnel establishment and establishes User Plane Bearers between eNodeB and S GW.
- UDP/IP: These are the backbone network protocols used for routeing user data and control signalling.
- LTE-Uu: The radio protocols of E-UTRAN between the UE and the eNodeB are specified in TS 36.300 [5].

eNodeB - S GW

UE - PDN GW user plane with 2G access via the S4 interface

UE - PDN GW user plane with 3G access via the S12 interface

UE - PDN GW user plane with 3G access via the S4 interface