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LTE presentation

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Luis Antonio Jaimes Illanes

on 5 February 2016

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Transcript of LTE presentation

Luis Jaimes Illanes
LTE Technology,
Architecture and Protocols

LTE Introduction
!And more!
Quality of Service
Incremental
throughput
Mobile Roadmap
Evolution of 3GPP UMTS
Terrestrial Radio Access
(E-UTRA) technology.
Long Term Evolution (LTE)
Evolved Packet System (EPS)
Evolution of the complete 3GPP UMTS
Terrestrial Radio Access, Packet Core, and its integration into legacy 3GPP/non-3GPP networks.
Physical layer techniques
Wireless channel
Guard
Band
OFDMA: sub-carriers dynamic assignment
according with radio channel conditions.
SC-FDMA (Single Carrier – Frequency Division Multiple
Access): OFDMA modification, power savings.
Modulation and Codification Schemes (MCS)
For data compression.
Source codification
Channel codification
To minimize wireless channel effect over transmitted symbols. It uses Convolutional Coding (CTC)
LTE Network Architecture
Channels and protocols
Releases, features and standards in LTE
Dowlink
Uplink
Multi-antenna
system
Modulation and Codification Schemes
Multiplexing and Multiple Access
Radio Module
A
Multi-antenna
system
Modulation and Codification Schemes
Multiplexing and Multiple Access
It involves
High data rates
Reduced latency
Improved end-user Throughputs
Increased radio frequency deployment bandwidth
1.4 MHz
3 MHz
5 MHz
10 MHz
20 MHz
Lower equipment costs
than CS 2G and 3G wireless infrastructure
Increased interoperability
between equipment from different vendors
Flexibility
to handle
voice
,
data
, and
future traffic
requirements.
Open interfaces
Easier handling
because of
flatter IP network
with fewer network elements
For MIMO systems:
capacity increases linearly with
min(M,L)
. M and L are the number of transmit and receive antennas, respectively.
Topology changes
in network deployment
LTE
HSPA+
"Natural" and most economical
upgrade from HSPA
Backward compatible with
all UMTS evolutions
Optimal performance
for single and aggregated
5 MHz carriers
High HSPA
voice capacity and
simultaneous voice
and data services
MIMO support
Interoperates seamlessly with 3G through multimode devices
Higher peak data rates through wider bandwidths
Boosts data capacity in dense urban deployments
Optimized mobile
OFDMA solution for
new and wider spectrum
Optimal technology for TDD deployments
HSPA+ and LTE are on
Parallel Evolution Paths
Standards Timeline
Release 8
OFDMA
air interface
MIMO
Amplitude
Frequency
Spectral efficiency!
FDMA
OFDMA
Applications and Services
Network technologies
IP
All IP network
Reduce costs!
Generate revenues!
Flexible deployment spectrum
Data rate
Time
Data rate
Time
Downlink
100 Mbps
20 MHz
5 bps/Hz
UPLINK
50 Mbps
2,5 bps/Hz
20 MHz
12
6
3
9
Control Plane Latency
< 100 ms
Camped
state
Active
state
< 50 ms
Dormant
state
Control Plane Capacity
At least 200 users/cell!
Active
Up to 5 MHz
12
6
3
9
User Plane Latency
< 5 ms
Unloaded condition
User
Throughput
Downlink:

3-4 times R6 HSDPA
(average throughput/MHz)
Uplink:

2-3 times R6 HSDPA
(average throughput/MHz)
Mobility
Optimized
for "low mobile speed": 0 to 15 [Km/h]
High performance
for "high" speeds: 15 to 120 [Km/h]
Mobility maintained
for "very high" speeds: 120 to 350 [Km/h]
5 [Km]
5-30 [Km]
100 [Km]
Coverage
Advanced Tx/Rx schemes and multiple-antenna support
UTRAN
GERAN
E-UTRAN
< 300 [ms]
Inter-working with 3GPP and non-3GPP systems
Release 9
MBMS (Multimedia Broadcast Multicast Service)
Antenna
?
?
?
?
LCS (Location Control Service) Control Plane for EPS
To meet emergency, lawful intercept and security requirements!
Architecture aspects of Home eNodeB/ eNodeB
Security
Quality of Service
Charging
Access restrictions
Release 10
LTE Advanced
January 2010
Peak data rates
:
DL 1 Gbps; UL 500 Mbps
Increased transmission bandwidth
: from 70 MHz to 100 MHz
Relay nodes
Meets 4G requirements
Cooperative MIMO
Spectrum Efficiency
Downlink
Uplink
Peak: 30 bps/Hz
Average: 2,4-3,7 bps/Hz
Cell edge: 0,07-0,12 bps/Hz
Peak: 15 bps/Hz
Average: 1,2-2,0 bps/Hz
Cell edge: 0,04-0,07 bps/Hz
12
6
3
9
Control Plane Latency
< than in LTE
< 10 ms from Dormant to Active
User Plane Latency
< 50 ms from Idle to Active
Release 11,
12 and so on
There is a lot of
Work
to do!
First
LTE release
December 2008
complex networks!
Operators must face
market
financial
challenges
and
Source: INFORMA TELECOMS & MEDIA, 2011
Decoupling
According with the following
development aspects
Based on
technological evolution
Let's clarify some terms before talking about
LTE systems
Which benefits could we obtain?
Let's see an analogy with
multicarrier concept!
And this one is for the
orthogonality concept :)
This is a 3D model representation of OFDM
Let's look at the tricks that made OFDM orthogonal
Subcarrier spacing
Modulation Symbol Time
Integer Number of Carrier Cycles
Multipath propagation
Multipath fading
Delay spread
Problems related with multipath propagation
Inter-Symbol-Interference (ISI)
Can you come up with a solution to overcome ISI?
And what about multipath effects in the frequency domain?
Doppler shift
We can mitigate
ICI
ISI!
and
Inter-Carrier-Interference (ISI)
We need to reduce costs!!
Could you suggest any option?
could be useful!!
Fourier Transforms
Multiple antennas techniques
Previously...
Gain
Beamwidth
Space-Time Coding (STC)
Space Diversity
Time Diversity
Space-Frequency Coding
Frequency Hopping Diversity Coding (FHDC)
Spatial Diversity
Frequency Diversity
How does the receiver figure out which is the correct amount of phase adjustment?
How does the transmitter knows which is the correct amount of phase adjustment?
This is the main motivation for using MIMO
Some important considerations about MIMO in LTE!
Used only for downlink
2 or 4 transmit antennas at the eNodeB
2 or 4 receive antennas at the UE
Spatial Multiplexing increases data rate
Won't work everywhere!
Uplink constraints
3 subcarriers
6 subcarriers
12 subcarriers
Peak-to-Average Power Ratio
3 subcarriers
6 subcarriers
12 subcarriers
Requires highly lineal amplifiers!
Reduced PAPR, better power amplifiers efficiency and lower cost of them
Frequency domain equalization
Flexible bandwidth assignment
In summary, SC-FDMA provides:
MIMO channel mapping
x1,x2,x3,x4,...
y1,y2,y3,y4,...
x1,x2,...
y1,y3,...
y2,y4,...
Pre-
coding
(Matrix V)
z1(1),z2(2),...
z2(1),z2(2),...
z3(1),z3(2),...
z4(1),z4(2),...
S/P
S/P
S/P
S/P
z1(1)
z1(2)
z2(1)
z2(2)
z3(1)
z3(2)
...........
...........
z3(1)
z3(2)
...........
...........
IDFT
IDFT
IDFT
IDFT
CP
CP
CP
CP
Antenna 1
Antenna 2
Antenna 3
Antenna 4
CP
extraction
DFT
3GPP
(3rd Generation Partnership Project) standarization group
has proposed
LTE
(Long Term Evolution) as a technological alternative to face
Operator's challenges
In fact...
December 2009
Modulation and Codification Schemes
Source codification
For data compression!
Channel codification
To minimize wireless channel effects over transmitted symbols. It uses Convolutional Coding (CTC)
General link structure
OFDM transmitter
P/S
..........
Flow of Antenna 1
CP
extraction
DFT
P/S
..........
Flow of Antenna 1
Mr antennas
.......................
.......................
MIMO receptor
Channel flow 1
Channel flow r
.......................
Channel to flow mapping
Flow 1
Flow N
.......................
Channel
OFDM receiver
300 Mbps
100 Mbps
Full transcript