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LTE Presentation

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by

Muhammad Dya

on 19 February 2014

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Transcript of LTE Presentation

OFDMA for downlink.
LTE Technology Specs(2)
Digital.
LTE Technology Specs
Two types for LTE frame structures:
TDD.
FDD.
LTE Frame Structure
Why LTE?
LTE Presentation
Introduction to the past generations:
1G(First Generation)
Analog not digital.
Lack of security.
Meaningless data service.
No roaming capability.
lack of capacity saturation
2G(Second generation)
GSM
Digital Technique(TDMA).
Higher capacity and security.
Offer SMS(Short Message Service).
Circuit switched data.
Data rate: 9.4Kbps circuit switched and 14.4Kbps for data service(Too slow).
3G(Third Generation)
UMTS
Higher transmission rate:
-2Mbps for stationary or nomadic use.
-348Kbps for moving vehicle.

2.5G(GPRS)
Theoretical data rate: 171.2Kbps.
Typical data rate: 4Kbps to 50Kbps.
(Packet switched data)
2.75G(EDGE)
Theoretical data rate: 553.6Kbps.
Typical data rate: 120Kbps.
(Packet switched data)
HSDPA
High Speed Down-link Packet Access.
Data rate: 14.4Mbps.
HSUPA
High Speed Up-link Packet Access.
Data rate: 5.76Mbps.
HSPA+
High Speed Packet Access+.
Data rate: 28.8Mbps.
(Downlink and Uplink)
3GPP Releases
LTE Provides
High data rates.
Reduced latency.
Improved user throughput.
Increased radio frequency deployment bandwidth.
Lower equipments costs than circuit switching 2G and 3G wireless infrastructure.
Flexibility to handle voice, data ,and future traffic requirements.
Open interfaces.
LTE Targets
Increasing the user’s throughput.
Decreasing the latency factor.
Increasing the spectral efficiency.
To enhance Bandwidth
LTE provides channels with bandwidths starting from 1.4MHz up to 20MHz.

(1.4 - 3 - 5 - 10 - 15 - 20)MHz
To enhance SNR
LTE key technologies:
OFDMA.
MIMO.
Adaptive Modulation.
OFDMA
MIMO
What is MIMO?
Adaptive Modulation
Concerning throughput
Shannon's theory states that:
C=Blog2(1+SNR)
So to enhance capacity of information of each user, we will enhance Bandwidth and Signal to Noise ratio.
Concerning Latency
Concerning Spectral Efficiency
FDD
1 Frame = 20 slot = 10ms.
1 slot = 0.5ms.
1 Subframe = 2 Slots = 1ms.
1 Slot = 7 Symbols ( Normal CP).
1 Slot = 6 Symbols ( Extended CP ).
10 Subframes for Downlink transmission.
10 Subframes for Uplink transmission.
TDD
TDD frame structure is the concept of “special subframes”:
This includes a DwPTS (Downlink Pilot Time Slot), GP (Guard Period) and UpPTS (Uplink Pilot Time Slot).
These have configurable individual lengths and a combined total length of 1ms.
10 subframes are shared between the uplink and the downlink.
Cellular Concept(amazing freq. reuse).
Increased spectrum flexibility: 1.4 - 20 MHz.
C=Blog2(1+SNR)
Download rates up to 300 Mbps and upload rates up to 75 Mbps
Low data transfer latencies.
Support mobility up to 500 KM/hr.
SC-FDMA for uplink.
Support FDD or TDD.
Support all freq. bands "700, 900, 1800, 1900, 2100, 2600, ...."
Simplified architecture.
Spacing between subcarriers is 15 KHZ.
packet Switching.
LTE Technology Specs(3)
Cyclic Prefix(No ISI).
IP V6 (Static IPs not Dynamic)
Apps like "HD video calls-HD video streaming-Mobile TV-IPTV-Cloud computing"
7 OFDM Symbols (Normal CP ) & 6 OFDM Symbols ( Extended CP ) :
Spacing between sub-carriers is 15 KHz, this achieves orthogonality.
FDMA vs. OFDMA
OFDMA vs. FDMA?
ISI and Cyclic Prefix.
OFDMA Implementation.
OFDMA Advantages.
OFDMA Disadvantages.
Advantages
Higher BW efficiency.
Multipath fading:
So ISI problem Happens
CP (Recovery from ISI)
NO ISI "CP".
Low hardware complexity.
Higher bitrates.
Anti-fading system.
Disadvantages
High PAPR (Peak to Average Power Ratio).
Frequency Doppler shift.
Implementation of OFDMA (DL) and SC-FDMA (UL):
Antenna Configuration.
Why MIMO?
Antenna Configuration:
QPSK
16-QAM
64-QAM
Traffic
BPSK
Control
LTE Channels
Logical Channels.
Transport Channels.
Physical Channels.
Logical Channels
BCCH (DL).
PCCH (DL).
CCCH (DL-UL).
DCCH (DL-UL).
MCCH (DL).
Transport Channels
Downlink
Physical Channels
Control
Traffic
DTCH (DL-UL).
MTCH (DL).
Uplink
BCCH PCCH CCCH DCCH DTCH MCCH MTCH
BCH PCH
MCH
DL-SCH
CCCH DCCH DTCH
UL-SCH
PCCH (DL, UL).
PSCH (DL, UL).
PBCH (DL).
PMCH (DL).
LTE Network Structure
UE
E-UTRAN
Functions:
Coverage of 4G cell.
Mod. and Demod. (QPSK-16QAM-64QAM).
Ciphering and Deciphering.
Allocation of subcarriers.
Release of subcarriers.
Power control commands.
Synchronization.
Error correction.
MIMO (2*2 or 4*4).
Cyclic prefix.
S-GW.
P-GW.
HSS:
PCRF
Billing.
Resource Block
Resource Block bitrate:
ME
E-USIM
E-Node B
1) Master copy of the subscriber profile.
2) Location info (MME).
MME:
1) Authentication and security.
2) TA updates.
3) Subscription profile of the served UE.
LTE Advanced
Carrier BW=100Mhz.
Asymmetric bandwidth assignment for FDD.
SONs "Self Organizing Networks" methodologies.
Carrier aggregation.
Femtocells.
Relays.
COMP “Coordinated multipoint”.
Cognitive radio.
D2D.
Carrier aggregation:
COMP “Coordinated multipoint”:
D2D:
Relays:
Femtocells:
Cognitive radio:
Network structure: Less no. of stages.
In case of handover: Less no. of stages.
The End
Thank You for Your Time
Full transcript