Figure 2.3: User Plane (UP) protocol from UE to S-GW/P-GW
Figure 2.3 shows the UP protocol that exists between UE and S-GW/P-GW. Again the
UE-eNodeB interface is governed by LTE-Uu interface and eNodeB-S-GW interface is
governed by S1 interface. S-GW and P-GW are connected by S5/S8 interface. UP pro-
tocol is similar to the CP protocol with the basic difference that the CP carries signaling
data packets while UP carries user data packets.
GPRS Tunneling Protocol-User Plane (GTP-U) is used to communicate the end user IP
packets belonging to single EPS bearer between the EUTRAN and the EPC. X2 inter-
face is the interface of eNodeB with its neighboring eNodeBs. It becomes an important
element in the mobility. X2 protocol addresses both UP and CP connection.
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