The document summarizes Long Term Evolution (LTE) technology. It discusses the evolution of LTE from 3G networks and its key features like downlink speeds of 100Mbps. The technologies that LTE uses are described, including OFDMA for downlink and SC-FDMA for uplink. LTE architecture is explained as a flat all-IP architecture with E-UTRAN and EPC components. Future applications of LTE Advanced and 4G are also mentioned.
1. LONG TERM
EVOLUTION(LTE)
NIGEL THOMAS
S7-B
ROLL NO: 23
COLLEGE OF ENGINEERING CHENGANNUR
SEMINAR-2010
2. CONTENTS
2
INTRODUCTION
EVOLUTION OF LTE
FEATURES OF LTE
TECHONOGIES USED IN LTE
LTE / SAE ARCHITECTURE
FUTURE SCOPE
CONCLUSION
REFERENCES
SEMINAR-2010
3. INTRODUCTION
3
LTE- LATEST MOBILE BROADBAND TECHNOLOGY
3RD GENERATION PARTNERSHIP PROJECT (3GPP)
LTE IS ONLY 3.9G
NETWORK DEPLOYED IN DECEMBER 2009 BY
TELIASONERA
HI-SPEED INTERNET ON THE MOVE!!!
SEMINAR-2010
5. FEATURES OF LONG TERM EVOLUTION
5
DOWNLINK SPEED : 100 Mbps
UPLINK SPEED : 50 Mbps
LATENCY : less than 10 ms
MOBILITY : upto 360 km/hr
CELL SIZE (Range) : upto 100 km
BANDWIDTH : 1.4, 3, 5, 10, 15, 20 MHz
Co-existent with legacy 3GPP and non-3GPP networks
Flat , All–IP Architecture
Low CAPEX and OPEX
SEMINAR-2010
6. TECHNOLOGIES USED IN LTE
6
OFDMA–Orthogonal Frequency Division Multiple Access
SEMINAR-2010
7. OFDMA contd…
7
Features of OFDMA
Robust to narrow band co-channel interference
Helps in QoS and better system spectral efficiency
Modulation Schemes: QPSK, 16QAM, 64QAM
Advantages of OFDMA
Multi-user Diversity: allows different users to transmit over
different portions of the spectrum
Efficient use of spectrum
Receiver Simplicity- only FFT processor required
Drawback of OFDMA
High Peak to Average Power Ratio(PAPR)
SEMINAR-2010
8. SC-FDMA (Single Carrier FDMA)
8
SC-FDMA is DFT-Spread OFDMA scheme.
It has low Peak to Average Power Ratio (PAPR), hence used as
up-link access scheme.
Helps in increasing cell size.
Modulation Schemes: QPSK, 16QAM
Transmitter and Receiver
Structure of SC-FDMA
SEMINAR-2010
9. MIMO (Multiple Input Multiple Output) Antenna
9
Aims:
• To improve SNR
• To Share SNR
Types of Transmission:
• Spatial Multiplexing
• Transmit Diversity
• Closed Loop- Linear pre-
coding and Rank Adaptation
Benefits: Increased Capacity,
Coverage and Cell throughput
SEMINAR-2010
11. 11
User Plane Architecture
PDCP –Packet Data
Convergence Protocol
RLC- Radio Link Control
MAC- Medium Access
Control
PHY- Physical Layer
Control Plane Architecture
NAS- Non access Stratum
SEMINAR-2010
12. FUTURE SCOPE
12
LTE Advanced = 4G
Global standard of Communication
Inter-Appliance communication i.e.
communication between electronic
appliances.
Voice + Data = 4G
SEMINAR-2010
13. CONCLUSION
13
3GPP Long Term Evolution achieves the lightning speed of
access, it’s robustness to interference and the high Quality
of Service meeting its performance targets using the
following technologies, i.e., OFDMA, SC-FDMA, MIMO
Antenna, and the simpler E-UTRAN LTE/SAE
Architecture.
LTE provides a good foundation in achieving the IMT-
Advanced/4G specifications by evolving into the LTE
Advanced Technology.
SEMINAR-2010
14. REFERENCES
14
[1.]David Astély, Erik Dahlman, Anders Furuskär, Ylva Jading,
Magnus Lindström, and Stefan Parkvall, LTE: The Evolution of
Mobile Broadband, IEEE Communications Magazine, April
2009, Vol. 47, no. 4, pp. 44 – 51.
[2.] Mamoru Sawahashi, Yoshihisa Kishiyama, Hidekazu Taoka,
Motohiro Tanno, and Takehiro Nakamura, Broadband Radio
Access: LTE and LTE-Advanced, International Symposium on
Intelligent Signal Processing and Communication Systems
(ISPACS 2009), Dec. 2009, pp. 224-227.
[3.] www.3gpp.org/lte (accessed on 12/08/2010)
[4.] http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution
(accessed on 12/08/2010)
SEMINAR-2010