Signalling in E-UTRAN: X2 Interface

in Tutorial, presentation, E-UTRAN, LTE

“Signalling in E-UTRAN/LTE” course focuses on signalling between EPS/LTE nodes within E-UTRAN. During the course all protocols and signalling procedures on all interfaces (i.e. Uu, X2 and S1) within E-UTRAN are presented in details. The course also describes overview of EPS architecture and system wide signalling procedures, including EPC - E-UTRAN interworking.

Evolution of Single Radio Voice Call Continuity (SRVCC)


Along with LTE introduction, 3GPP also standardized Single Radio Voice Call Continuity (SRVCC) in Release 8 specifications to provide seamless continuity when an UE handovers from LTE coverage (E-UTRAN) to UMTS/GSM coverage (UTRAN/GERAN).

Network Sharing in LTE

in Blog, E-UTRAN, 4G, eNB, LTE, MME

3GPP network sharing architecture allows different core network operators to connect to a shared radio access network.

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:

LTE UE Classes


UE class determines the speed at which data can be transferred in uplink and downlink directions. For GPRS & UMTS, most of us already are aware of it.

3GPP Release 11 Features and Study Items

in Blog, 3GPP, IMS, E-UTRAN, LTE

3GPP has already started work on Release 11. See objectives of features & study items from 3GPP Work Items below.

LTE Handovers - Intra E-UTRAN Handover

in Blog, Handover, Intra, Intra E-UTRAN Handover, SGW, E-UTRAN, eNB, LTE, MME

Intra E-UTRAN Handover is used to hand over a UE from a source eNodeB to a target eNodeB using X2 when the MME is unchanged. In the scenario described here Serving GW is also unchanged.

Measurements in LTE E-UTRAN

in Blog, ARFCN, Inter-frequency, Intra-frequency, Measurement, E-UTRAN, RRC, LTE

In LTE E-UTRAN measurements to be performed by a UE for mobility are classified as below

LTE UE positioning in E-UTRAN

in Blog, E-UTRAN, LTE, LteWorld

UE Positioning function is required to provide the mechanisms to support or assist the calculation of the geographical position of a UE.

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

LTE Advanced: Evolution of LTE

in Blog, E-UTRAN, HSUPA, HSDPA, EPC, HSPA, LTE, LTE Advanced, LteWorld

August 14, 2009 | LTE standards are in matured state now with release 8 frozen. While LTE Advanced is still under works. Often the LTE standard is seen as 4G standard which is not true. 3.9G is more acceptable for LTE. So why it is not 4G? Answer is quite simple - LTE does not fulfill all requirements of ITU 4G definition.

LTE Security Principles

in Blog, 3GPP, E-UTRAN, LTE, LteWorld, Security

The following are some of the principles of 3GPP E-UTRAN security based on 3GPP Release 8 specifications: