LTE Technology
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Transcript of LTE Technology
![Page 1: LTE Technology](https://reader030.fdocuments.in/reader030/viewer/2022020311/56d6c0a81a28ab30169b4a24/html5/thumbnails/1.jpg)
LTE Technology ; An Evolution
By;Usman Qureshi
RF Optimization EngineerChina Mobile Pakistan.
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Outline• Motivation of LTE• LTE Technology Basics
Key ParametersOFDMA and Downlink Frame StructureSC-FDMA and Uplink Frame StructureNetwork & Protocol ArchitectureLTE UE categories
• Radio ProceduresCell SearchSystem Information BroadcastEPS Bearer SetupDownlink & Uplink Data TransmissionMobilityMIMO
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LTE Market Situation – Based on HSPA Success Story
•HSPA growth is based on the Uptake Of Mobile Data services world wide.More than 250 networks world wide have already commercially launched HSPA.
•Mobile Data Traffic is growing Exponentially, caused by Mobileinternet offerings and improved user experience with new device types.
•LTE is accepted worldwide as the long term evolution perspective for today’s Today’s 2G and 3G networks based on WCDMA/HSPA, GSM/EDGE, TD-SCDMA, etc
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Evolution of LTE (FDD & TDD)
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LTE Vs HSPA
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LTE – Basic Drivers
• Reduced Latency Radio Access Network Latency (User Plane UE-RNC-UE) below 10ms.
Significantly reduced control panel Latency.
• Higher User Data Rates 100 Mbps (Downlink) & 50 Mbps (Uplink)
• Improved System Capacity & Coverage Support for Scalable Bandwidth:1.4, 3 , 5, 10, 15, 20 Mhz
Support for Internetworking with Legacy networks
• Cost Reduction Reduced CAPEX & OPEX including Backhaul.
Cost Affective Migration from Legacy networks.
• Improved Spectrum Efficiency 2-4 times better than 3GPP Release 6
Support for Paired & unpaired spectrum (FDD & TDD mode)
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LTE/SAE Network Architecture
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Protocol Stack – User Plane
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Protocol Stack – Control Plane
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LTE Key Parameters
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What is OFDM ?
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OFDM Signal Generation Chain
OFDM Signal generation is based on Inverse Fourier Transform (IFFT) operation On transmitter side.
On Receiver side, an FFT operation will be used.
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OFDMA & OFDMOFDM allocates users in time domain only
OFDMA allocates users in time & Frequency domain
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LTE Downlink Frame Structure
•LTE Provides QPSK, 16QAM, 64QAM as downlink modulation schemes.•Cyclic prefix is used as guard interval, with different configurations;
Normal Cyclic Prefix Extended Cyclic Prefix
•15 Khz subcarrier spacing•Scalable Bandwidth.
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OFDMA Time- Frequency Multiplexing
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LTE Spectrum FlexibilityLTE Physical layer supports any bandwidth from 1.4 MHz to 20 MHz in steps of 180 KHz (resource block)Current LTE specification supports a subset of 6 different system bandwidthsAll UEs must support the maximum bandwidth of 20 MHz.
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Mapping between Logical & Transport
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LTE Radio Procedures
Lte Initial Access Procedure is shown below, before going into the details ofThese procudres
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Downlink Physical Channels & Signals
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Cell Search in LTE
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Cell Search in LTE, Reference Signals
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Random Access Procedure
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Hybrid ARQ in the downlink
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Uplink Physical Channels & Signals