X2 layer 1

in Specification, LTE, X2

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

X2 Application Protocol (X2AP)

in eNodeB, Specification, E-UTRAN, LTE, X2, X2AP

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

X2 Signalling Transport

in Specification, LTE, X2

X2 signalling bearer provides the following functions:

GPRS Tunnelling Protocol User Plane (GTP-U)

in GTP-U, S4, S5, S8, Specification, LTE, S1, X2

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

GTP-U Transport

in S4, S5, S8, Specification, UDP, IP, LTE, S1, X2

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

LTE RAN architecture aspects

in Whitepaper, E-UTRAN, eHNB, LTE, LTE Advanced, MME, S1, X2

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

It has following contents

  • EPS architecture