LTE Technology Leyers

LTE video tutorial

Rohde & Schwarz's 14-part presentations provide an excellent introduction to LTE. The presentations start with a background on LTE. This is followed by lectures that cover LTE frequency bands, OFDM, OFDMA, SC-FDMA and LTE signaling. The lectures also cover channel mapping and UE categories.

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LTE physical layer

An excellent overview of the LTE physical layer. Get an overview of OFDM and SC-FDMA transmit and receive chains. LTE channels and reference signals are described in detail. Highly recommended.

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LTE link layer design

This article describes the LTE link-layer protocols, which abstract the physical layer and adapt its characteristics to match the requirements of higher layer protocols.The LTE link-layer protocols are optimized for low delay and low overhead and are simpler than their counterparts in UTRAN. The state -of-the-art LTE protocol design is the result of a careful crosslayer approach where the protocols interact with each other efficiently. This article provides a thorough overview of this protocol stack, including the sub-layers and corresponding interactions in between them, in a manner that is more intuitive than in the respective 3GPP specifications.

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Introduction to LTE architecture

This article provides an overview of the LTE radio interface, together with a more in-depth description of its features such as spectrum flexibility, multi-antenna transmission, and inter-cell interference control. The performance of LTE and some of its key features is illustrated with simulation results.
This article provides a high-level overview of LTE and some of its key components: spectrum flexibility, multi-antenna transmission, and ICIC. Numerical simulations are used to show the performance of the first release of LTE, as well as assess the benefit of the key features. Indeed these contribute strongly to LTE meeting its performance targets. An outlook of the evolution of LTE toward LTE-Advanced and full IMT-Advanced capabilities complete the article. Clearly, LTE offers highly competitive performance and provides a good foundation for further evolution.

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LTE network architecture

This paper provides a short, but comprehensive, overview of the LTE network architecture and interfaces. The paper introduces control plane and user plane architecture. LTE procedures on S1 and X2 interfaces are described in detail. The paper also briefly touches the bearer establishment procedure.

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EPS architecture overview

This excellent video by Russell DeLong covers the EPS in detail. The topics covered here are:
Terminology clarifications for "4G LTE" and the EPS.
Overview of each component of EPS. Russell walks you through the role of the MME, the S-GW and the P-GW.
Overview of each logical connection between each component on the EPS.

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LTE channels and protocol layers

This paper provides an overview of the MAC for 3GPP™ Long Term Evolution (LTE) also referred to as E-UTRAN, with a focus on the handset or User Equipment (UE). The protocol stack functions consist of the Medium Access Control (MAC), Radio Link Control (RLC), Packet Data Convergence Protocol (PDCP), and Radio Resource Control (RRC).
LTE uses all the time on the downlink for conveying data; the downlink PHY is fully scheduled so there are no gaps due to arbitration or contention except for the initial access on the random access procedure. The downlink carries multiple logical channels over one link, so a lot of information is multiplexed together in one transport block, as opposed to other networks where any given packet is only carrying one type of information at a given time, such as in a control plane or a user plane..

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LTE physical layer presentation

The presentation covers LTE architecture, frame structure, channels, MIMO and scheduling. OFDM and SC-FDMA are also covered.

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