LTELong Term Evolution

BY: ENG. Waleed Elsafoury

Copyright © 2011 Waleed Elsafoury

COURSE CONTENTS

• 3GPP Releases• LTE Enabling Technologies • LTE Network Structure• LTE Radio Interface• LTE Procedures• LTE Physical Layer

G Access Teq.

System/service Data rate Modulatio

nCarrier

BW2G TDMA GSM 9.6Kbps GMSK 200Khz

2.5G TDMA GPRS 171Kbps GMSK 200Khz

2.75G TDMA EDGE 553Kbps 8PSK 200Khz

3G W-CDMA UMTS 2Mbps QPSK 5Mhz

3.5G W-CDMA HSDPA 14.4Mbps 16QAM 5Mhz

3.75G W-CDMA HSUPA 5.8Mbps 16QAM 5Mhz

3.8G W-CDMA HSPA+ 28Mbps 64QAM 5Mhz

3.9G OFDM & SCFDMA LTE 100Mbps 64QAM 20Mhz

4G OFDMA LTE Advanced 1Gbps 64QAM 100Mhz

3GPP Family

3GPP Releases

• IMSR4• HSDPAR5• HSUPAR6• HSPA+R7• LTER8• A5/4R9• LTE-AR10

How to increase data rate??

Shannon–Hartley theorem :

C: channel capacity in Bit/secB: Bandwidth in Hz

C = B log2 (1 + S/N )

S/N: signal-to-noise ratio

Why more data rates??

• More Applications

• More users

• Better performance

• High BW Efficiency

Testing BW efficiency !!

BW efficiency = rate / BW Bit per sec / Hz

• For GSM

• For UMTS

• For LTE

• GSM

• TDMA• 9.6 kbps

• GPRS

• coding schemes (C1-C2-C3-C4) based on S/N

• channel bundling• Packet switching

LTE Evolution

• EDGE

• Modulation coding schemes MCS1-9 based on S/N and distance from BS

• UMTS

• W-CDMA• Mixed services PS - CS

LTE Evolution

• HSDPA

•Codes Bundling•Fast(Node-B) ,Fair ,Channel dependence scheduling•Short sub-Frames “TTI TX. time interval”•Adaptive modulation

• HSPA+

•Higher Modulation order•MIMO

LTE Evolution

• LTE

• OFDMA / SC-FDMA

• LTE Advanced

•Carrier BW=100Mhz•Femto Cells•Cognitive radio•Relays•Carrier aggregation •COMP “Coordinated multipoint”

LTE Evolution

LTE Feature

Duplex Technique

FDD / TDD

Multiple Access

OFDMA/TDMASC-FDMA/TDMA

Modulation Adaptive Modulation BPSK – 64QAMBPSK for signaling only

Carrier BW 1.4MHz-20MHz flex. But not adaptive

Data rate 100Mbps/50MbpsMax speed Optimum 0-

15Km/hrHigh performance 15-120Km/hrSupported 500Km/hr

Band GSM&UMTS Bands