X2 layer 1

The main functions of X2 interface layer 1 are as following:

X2 Application Protocol (X2AP)

The X2AP protocol is used to handle the UE mobility within E-UTRAN and provides the following functions:

X2 Signalling Transport

X2 signalling bearer provides the following functions:

GPRS Tunnelling Protocol User Plane (GTP-U)

GTP-U protocol is used over S1-U, X2, S4, S5 and S8 interfaces of the Evolved Packet System (EPS).

GTP-U Transport

The transport layer for data streams over S1, X2, S4, S5 and S8  is an IP based Transport.

LTE RAN architecture aspects

Presented by Dino Flore: RAN WG3 Chair, Qualcomm at a recent IMT-Advanced workshop, in Beijing, China

It has following contents

  • EPS architecture