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Transmission Technologies

LTE System Engineering

Course Overview:

Course participants will first be introduced to the evolution of cellular networks and 3GPP related releases. Evolved Packed System (EPS) and Evolved Packet Core Architecture will be discussed in addition to Service Architecture Evolution (SAE) and LTE interfaces. Call setup in a LTE network will be covered. The course will then analyse the rationals behind LTE, its evolution and its competitors. Emphasis will be given to LTE network architecture, LTE physical interfaces, QoS issues, procedures, IP Security and LTE mobility.

Course Objectives:

This course will enable the course participants to understand the key differentiators of LTE technologies as well as LTE radio principles and systems engineering. What are the main network elements which constitute the LTE frame work? What is new and what will be eradicated?

Key Benefits:

The participants will gain a detailed knowledge of LTE systems engineering, its benefits and potential pitfalls. Course materials can be customized based on the background of the participants and their special requests. Printed student guides will be provided.

Pre-Requisite for Participants:

GSM, UMTS or WiMAX technology background.

Who Should Attend?

This course is suitable for those who need a strong background about the LTE air interface structure and mechanisms.
It is a pre-requisite for those in charge of the configuration, optimization and monitoring of a LTE network.

Course Duration:

3 days

Course Outlines:

LTE in a Nutshell

  • Introduction
  • 3GPP Evolution
  • Motivation

LTE is the latest standard in the mobile network technology tree that previously realized the GSM/EDGE and UMTS/HSxPA network technologies that now account for over 85% of all mobile subscribers. LTE will ensure 3GPP’s competitive edge over other cellular technologies.

LTE System Architecture

  • LTE Network Architecture
  • Network Elements – eNB, aGW (MME/UPE)
  • LTE Interfaces – S1-MME, S1-U, S3, S4, S5, S6a, Gx, S8 – 13 etc
  • System Architecture Evolution (SAE)
  • Evolved Packet Core (EPC)
  • E-UTRAN Architecture
lte system engineering

The LTE Air Interface

  • Physical layer
  • LTE Frame Structure
  • LTE Logical and Transport Channels
  • Layer 2 Procedures
  • OFDM
  • SC-FDMA
  • Multiple Antenna Techniques

One element that is shared by the LTE Downlink and Uplink is the generic frame structure. The LTE specifications define both FDD and TDD modes of operation.

This generic frame structure is used with FDD.  Alternative frame structures are defined for use with TDD.

LTE frames are 10 msec in duration. They are divided into 10 subframes, each subframe being 1.0 msec long. Each subframe is further divided into two slots, each of 0.5 msec duration. Slots consist of either 6 or 7 ODFM symbols, depending on whether the normal or extended cyclic prefix is employed.

lte system engineering

LTE performance requirements

  • Data Rate
  • Cell range
  • Cell capacity
  • Mobility
  • Latency
  • Improved spectrum efficiency
  • Scalable bandwidth
  • Multiple access schemes
  • Adaptive modulation and coding

LTE Protocols

  • Air Interface Physical Layer
  • GPRS Tunneling Protocol User Plane (GTP-U)
  • GTP-U Transport
  • Medium Access Control (MAC)
  • Non-Access-Stratum (NAS) Protocol
  • Packet Data Convergence Protocol (PDCP)
  • Radio Link Control (RLC)
  • Radio Resource Control (RRC)
  • S1 Application Protocol (S1AP)
  • S1 layer 1
  • S1 Signaling Transport
  • X2 Application Protocol (X2AP)
  • X2 layer 1
  • X2 Signaling Transport

System Architecture Evolution (SAE)

  • A common anchor point and gateway (GW) node for all access technologies
  • IP-based protocols on all interfaces
  • Simplified network architecture
  • All IP network
  • All services are via Packet Switched domain
lte system engineering

Evolved Packet Core (EPC)

  • MME (Mobility Management Entity)
  • 3GPP anchor
  • SAE anchor

Services

  • LTE Vs WiMAX
  • Key Features of LTE

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