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LTE — Long Term Evolution

Signaling flows and tutorials

  • EventHelix LTE
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    EventHelix
    Oct 4, 2018

    Moving 4G EPC to the Cloud

    CUPS — Control and User Plane Separation

    Facilitating 4G EPC…

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    EventHelix
    Jul 31, 2017

    Phased array antennas

    …and how they relate to droplets in a pond

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    EventHelix
    Jun 29, 2017

    LTE to 3G circuit switched fallback — CSFB

    Ever wondered why your phone falls back from LTE to 3G when making a voice call. This…

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    EventHelix
    Jun 4, 2017

    LTE EPS Architecture Overview

    Excellent video describing the Evolved Packet Core used in LTE networks. The video describes the roles played by the major LTE components:

    • eNodeB
    • MME
    • S-GW
    • P-GW
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    EventHelix
    Jun 4, 2017

    LTE MAC layer presentation

    Get an overview of the LTE MAC layer from this presentation:

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    EventHelix
    Jun 4, 2017

    LTE PDCP layer presentation

    The PDCP layer in LTE performs the following functions:

    • Transfer of upper layer PDUs;
    • Error correction through ARQ (only for AM data transfer)
    • Concatenation, segmentation and reassembly of RLC SDUs (UM…
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    EventHelix
    Jun 4, 2017

    LTE RLC presentation

    The Radio Link Control Layer in LTE provides a reliable message service over the unreliable radio link.

    Get an overview of the LTE RLC layer from this presentation:

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    EventHelix
    Jun 4, 2017

    LTE Identifiers: GUTI, GUMMEI, IMSI, RNTI, TAI and more

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    EventHelix
    Jun 4, 2017

    LTE security: encryption and integrity protection presentation and call flow

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    EventHelix
    Jun 3, 2017

    LTE attach and default bearer setup presentation

    Presentation describing LTE attach and default bearer setup messaging.

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    EventHelix
    Jun 3, 2017

    LTE RRC connection setup

    Establishing an RRC connection in LTE typically involves the following steps:

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    EventHelix
    Jun 3, 2017

    LTE attach and default bearer setup flow

    This call flow describes the signaling involved in LTE attach and default bearer setup…

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    EventHelix
    Jun 3, 2017

    LTE visualization tool

    The LTE Visualization Tool shows the organization of LTE channels in a subcarrier-symbol grid.

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    EventHelix
    Jun 3, 2017

    SCTP connection setup, reconfiguration and release

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    EventHelix
    Jun 3, 2017

    LTE physical layer tutorials

    @RohdeSchwarz presentations provide an excellent introduction to LTE. The presentations are accompanied with…

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    EventHelix
    Jun 3, 2017

    LTE X2 Handover between eNodeBs served by the same MME

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    EventHelix
    Jun 3, 2017

    LTE X2 Handover Sequence Diagrams

    Let’s examine the X2 Handover in detail. We look at the X2 handover signaling procedure through…

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    EventHelix
    Jun 2, 2017

    OFDM and SC-FDMA lectures

    OFDM and SC-FDMA video lectures cover OFDM and SC-FDMA is great detail. The following topics are covered:

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    EventHelix
    Jun 1, 2017

    LTE S1 handover between eNodeBs

    LTE networks prefer using the X2 interface for performing inter eNodeB handovers. An S1 handover is a…

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    EventHelix
    Jun 1, 2017

    Voice over LTE (VoLTE) originating call

    Voice over LTE (VoLTE) is the standard for voice call setup in LTE networks. When VoLTE is…

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    EventHelix
    May 31, 2017

    LTE security misadventures

    With AES-128 based encryption, LTE is the most secure radio access technology to date. Even though the data…

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    EventHelix
    May 31, 2017

    LTE random access procedure and contention resolution

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    EventHelix
    May 29, 2017

    Tracking Area Updates in an LTE network

    LTE Tracking Area Update signaling flow describes how mobiles keep the network updated…

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    EventHelix
    May 29, 2017

    LTE network design and planning videos

    Learn about LTE network design and planning from this video series. Issues involved in RF…

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    EventHelix
    May 28, 2017

    S1AP View of Inter MME S1 Handover in LTE

    Here we look at the S1 handover that involves an MME change. The S1 handover is…

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