LTE System Principle
-
Upload
btsupersuper -
Category
Documents
-
view
40 -
download
8
description
Transcript of LTE System Principle
www.huawei.com
Security Level: Internal Use
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
LTE system principle
2010-09
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Page 2
Upon completion of this course, you will be able
to :
Know the backgrounds of evolution
Know system architecture of LTE
Know key features of LTE
Objectives
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
3GPP TS 《36.401》
3GPP TS 《36.101》
3GPP TS 《36.211》
Page 3
References
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
1. Overview
2. LTE system architecture
3. LTE key features
Contents
Page 4
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
1. Overview
2. LTE system architecture
3. LTE key features
Contents
Page 5
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Mobile communications standards landscape
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
3GPP is working on two approaches for 3G evolution: the LTE
and the HSPA Evolution
HSPA Evolution is aimed to be backward compatible while LTE do
not need to be backward compatible with WCDMA and HSPA
By the end of 2007, 3GPP R8 is released as the first specs of LTE
Page 7
3GPP Releases
GSM
9.6kbit/s
GPRS
171.2kbit/s
EDGE
473.6kbit/s
UMTS
2Mbit/s
HSDPA
14.4Mbit/s
HSUPA
5.76Mbit/s
HSPA+
28.8Mbit/s
42Mbit/s
LTE
+300Mbit/s
Phase 1
Phase 2+
(Release 97)
Release 99
Release 99
Release 5
Release 6
Release 7/8
Release 8
Release 9/10
LTE
Advanced
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved Page 8
LTE will be the Single Global Standard
FDD LTE
TDD LTE
UMTS
CDMA
TD-SCDMA
GSM
WiMAX
700M
800M
850M
900M
1500M
1700M
1800M
1900M
2100M
2300M
2600M
……
LTE will be the natural migration choice for mobile operators.
84Mbps
/10MHz
21Mbps
/5MHz
42Mbps
/5MHz
64QAM 64QAM
2x2
MIMO
DC
64QAM
2x2
MIM
O 2x2
MIMO
28Mbps
/5MHz
Spectral Efficiency
Title
64QAM
>1.2Gbps
/80MHz
64QAM
300Mbps
/20MHz
OFDM OFDM
4x4
MIMO
New
Key
Tech.
4x4
MIMO
Relay
2x2
MIMO
64QAM
OFD
M
150Mbps
/20MHz
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
SDR Facilitating Smooth Evolution
Page
Technolog
y
800M 900M 1800M 2100M 2.6G
GSM
UMTS
LTE
GSM+UMTS
GSM+LTE
LTE
mRRU MRFU
SDR SDR
SDR SDR
GSM
2600MHz LTE
2100MHz UMTS
1800MHz GSM
900MHz
800MHz
2010 2011 2012
LTE
LTE
LTE
LTE UMTS
GSM
Spectrum refarming starts from
900M/1800M, which can be utilized
for LTE deployment.
SDR technology supports flexible and
smooth transition from 2G/3G to LTE.
Spectrum for LTE Smooth Transition to LTE
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Reduced delays, in terms of both connection establishment (less then
100ms) and transmission latency (less then 10ms)
Increased user data rates: (Peak data-rate requirements are 100
Mbit/s and 50 Mbit/s for downlink and uplink respectively, when
operating in 20MHz spectrum allocation)
Improved spectral efficiency
Seamless mobility, including between different radio-access
technologies
Supporting flexible spectrum allocation (1.4, 3, 5, 10, 15 and 20 MHz)
to meet the complicated spectrum situation requirement
Simplified network architecture
Reasonable power consumption for the mobile terminal.
Page 10
LTE requirements and targets
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
The LTE downlink transmission scheme is based on downlink
OFDMA and uplink SC-FDMA
LTE adopts shared-channel transmission, in which the time-
frequency resource is dynamically shared between users. This is
similar to the approach taken in HSDPA
Fast hybrid ARQ with soft combining is used in LTE
MIMO is supported by LTE, basically this is Spatial multiplexing
which can increase data rate prominently
LTE supports flexible spectrum allocation in terms of duplex
arrangement which support both FDD and TDD and bandwidth
allocations which ranges 1.4, 3, 5, 10, 15 and 20 MHz
Support SON
Page 11
LTE technical features
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
LTE is designed to operate in these frequency bands:
2.1GHz, 1.9GHz, 1.7GHz, 2.6GHz, 900 MHz, 800 MHz, 450 MHz,
etc , refer to 36.101 for details.
Transmission bandwidth could be:
Channel bandwidth BWChannel [MHz] 1.4 3 5 10 15 20
Transmission bandwidth configuration NRB 6 15 25 50 75 100
Transmission
Bandwidth [RB]
Transmission Bandwidth Configuration [RB]
Channel Bandwidth [MHz]
Res
ou
rce
blo
ck
Ch
an
nel e
dg
e
Ch
an
nel e
dg
e
DC carrier (downlink only)Active Resource Blocks Page 12
LTE frequency bands
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
LTE Release 8 Bands Band Duplex FDL_low
(MHz)
FDL_high
(MHz)
NOffs-DL NDL FUL_low
(MHz)
FUL_high
(MHz)
NOffs-UL NUL
1 FDD 2110 2170 0 0-599 1920 1980 18000 18000-18599
2 FDD 1930 1990 600 600-1199 1850 1910 18600 18600-19199
3 FDD 1805 1880 1200 1200-1949 1710 1785 19200 19200-19949
4 FDD 2110 2155 1950 1950-2399 1710 1755 19950 19950-20399
5 FDD 869 894 2400 2400-2649 824 849 20400 20400-20649
6 FDD 875 885 2650 2650-2749 830 840 20650 20650-20749
7 FDD 2620 2690 2750 2750-3449 2500 2570 20750 20750-21449
8 FDD 925 960 3450 3450-3799 880 915 21450 21450-21799
9 FDD 1844.9 1879.9 3800 3800-4149 1749.9 1784.9 21800 21800-22149
10 FDD 2110 2170 4150 4150-4749 1710 1770 22150 22150-22749
11 FDD 1475.9 1500.9 4750 4750-4999 1427.9 1452.9 22750 22750-22999
12 FDD 728 746 5000 5000-5179 698 716 23000 23000-23179
13 FDD 746 756 5180 5180-5279 777 787 23180 23180-23279
14 FDD 758 768 5280 5280-5379 788 798 23280 23280-23379
17 FDD 734 746 5730 5730-5849 704 716 23730 23730-23849
33 TDD 1900 1920 26000 36000-36199 1900 1920 36000 36000-36199
34 TDD 2010 2025 26200 36200-36349 2010 2025 36200 36200-36349
35 TDD 1850 1910 26350 36350-36949 1850 1910 36350 36350-36949
36 TDD 1930 1990 26950 36950-37549 1930 1990 36950 36950-37549
37 TDD 1910 1930 27550 37550-37749 1910 1930 37550 37550-37749
38 TDD 2570 2620 27750 37750-38249 2570 2620 37750 37750-38249
39 TDD 1880 1920 28250 38250-38649 1880 1920 38250 38250-38649
40 TDD 2300 2400 28650 38650-39649 2300 2400 38650 38650-39649
Page 13
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
1. Overview
2. LTE system architecture
3. LTE key features
Contents
Page 14
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
LTE System architecture
LTE: simplified IP flat architecture
Less equipment node and easier deployment
Less transmission delay and easier O&M
S1 and X2 interfaces are based on a full IP transport stack
eNB
MME / S-GW MME / S-GW
eNB
eNBS1 S1
S1 S1
X2
X2X2
E-UTRAN
UMTS LTE
Page 15
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Page 16
LTE-SAE System architecture
SAE
Control plane
User plane
Operator's
IP ServiceSGi
Rx
UE
S-GW P-GW
PCRF
Gx
S5
MME
HSS
S1-U
S11
S6a
LTE
S1-MME
LTE
-UuX2 S1-U
S1-MME
eNodeB
eNodeB
Gxc
An evolved core network, the Evolved Packet Core is at the same time
developed, which generally is called System Architecture Evolution.
The philosophy of the SAE is to focus on the packet-switched domain,
and migrate away from the circuit-switched domain
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Transfer of user data
Radio channel ciphering
and deciphering
Integrity protection
Header compression
Mobility control functions
Handover
Paging
Positioning
Inter-cell interference coordination
Connection setup and release
Load Balancing
Distribution function for NAS
messages
NAS node selection function
Synchronization
Radio access network sharing
MBMS function
Page 17
E-UTRAN functions
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
1. Overview
2. TE system architecture
3. LTE key features
Contents
Page 18
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Transmission by means of OFDM can be seen as a kind of multi-
carrier transmission.
Due to the fact that two modulated OFDM subcarriers are mutually
orthogonal, multiple signals could be transmitted in parallel over the
same radio link, the overall data rate can be increased up to M times.
Page 19
Basic principles of OFDM
Frequency
Guard Band
Channel
Bandwidth
Subcarrier
Frequency
Channel
Bandwidth
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Efficient use of radio spectrum includes placing modulated carriers as close
as possible without causing Inter-Carrier Interference (ICI)
In order to transmit high data rates, short symbol periods must be used, In
a multi-path environment, a shorter symbol period leads to a greater
chance for Inter-Symbol Interference (ISI).
Orthogonal Frequency Division Multiplexing (OFDM) addresses both of
these problems:
OFDM provides a technique allowing the bandwidths of modulated
carriers to overlap without interference (no ICI).
It also provides a high date rate with a long symbol duration, thus
helping to eliminate ISI.
Page 20
Why use OFDM?
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
OFDM modulation implementation in LTE
Normally ,assume LTE sub carrier frequency f =1/Tu=15khz, and
IFFT bin size N=2048, the sampling rate is fs =1/Ts
=N ·f=30720000Hz
Page 21
OFDM implementation by IFFT/FFT
Coded
BitsIFFT
Serial
to
Parallel
Subcarrier
Modulation
RF
Inverse Fast
Fourier
Transform
Complex
Waveform
Coded
Bits
Parallel
to
Serial
FFT
Subcarrier
Demodulation
Receiver
Fast Fourier
Transform
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
LTE Channel and FFT Sizes
Channel Bandwidth
FFT Size Subcarrier Bandwidth
Sampling Rate
1.4MHz 128
15kHz
1.92MHz
3MHz 256 3.84MHz
5MHz 512 7.68MHz
10MHz 1024 15.36MHz
15MHz 1536 23.04MHz
20MHz 2048 30.72MHz
Page 22
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Page 23
Cyclic-prefix insertion
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Time dispersion on the radio channel may cause ISI
To deal with this problem, cyclic-prefix insertion is typically used
in case of OFDM transmission
The last NCP samples of the IFFT output block of length N is copied
and inserted at the beginning of the block, increasing the block
length from N to N +NCP. At the receiver side, the corresponding
samples are discarded before OFDM demodulation
Subcarrier orthogonality will then be preserved also in case of a
time-dispersive channel, as long as the span of the time
dispersion is shorter than the cyclic-prefix length.
Cyclic-prefix insertion
Page 24
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Downlink CP Parameters
Configuration CP Length (Ts) Time Delay Spread
Normal Cyclic
Prefix
∆f = 15kHz 160 for slot 0 ~ 5.208µs ~ 1.562km
144 for slot 1, 2, …6 ~ 4.688µs ~ 1.406km
Extended Cyclic
Prefix
∆f = 15kHz 512 for slot 0, 1, …5 ~16.67µs ~ 5km
∆f = 7.5kHz 1024 for 0, 1, 2 ~ 33.33 µs ~ 10km
Page 25
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
High spectrum efficiency - the bandwidth of each subcarrier would
be adjacent to its neighbors, so there would be no wasted spectrum
With multiple subcarriers transmitting in parallel, long symbol
duration is used, thus OFDMA is more tolerant to multi-path
environment and better entitled to eliminate ISI (inter symbol
interference)
Especially with a cyclic prefix, inter-symbol interference could be
minimized
OFDM is flexible in allocating power and rate optimally among
narrowband sub-carriers (scheduling)
Frequency diversity could be enabled due to the wide spectrum
Page 26
Advantage of OFDM
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Peak to Average Power Ratio
Amplitude
Time
OFDM
Symbol
PAPR (Peak to
Average Power Ratio)
Issue
Peak
Averag
e
The drawback of OFDM is the high peak-to-average ratio of the
transmitted signal, which greatly decrease the efficiency of the
linear amplifiers
This is especially critical for the uplink, due to the high
importance of low mobile-terminal power consumption and cost.
Page 27
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
SC-FDMA, which has much in common with OFDMA, such as multi-
carrier technology and guard interval protected symbol, but much
higher power amplifier efficiency (lower PAPR) is adopt in uplink.
SC-FDMA is just the DFT-S-OFDM, which can be seen as an OFDM
system with a DFT pre-coding. The localized RB distribution makes
each user occupy consecutive part of the whole bandwidth, which
looks like a single carrier.
Page 28
SC-FDMA in uplink
Time Domain
CP
Insertion
Subcarrier
Mapping
Frequency Domain
DFTSymbols
Time Domain
IDFT
0
0
0
0
0
0
0
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
eNB
UE
OFDM used in LTE
OFDM
(OFDMA)
OFDM
(SC-FDMA)
eNB
UE
Radio
Channel
FDD Radio
Channel
UE
TDD
Page 29
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Frequency
PowerTime
Orthogonal Frequency Division Multiple
Access
OFDMA
Each user allocated a
different resource
which can vary in time
and frequency.
Page 30
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
35pt
32pt
) :18pt
Page 31
OFDMA used in LTE.
DL: OFDMA (Orthogonal Frequency Division Multiple Access)
Anti multi-path interference
Anti frequency selective fading
Higher spectrum efficiency
Easy to cooperate with MIMO for higher
throughput
Flexible multi-users scheduling
UL: SC-FDMA (Single Carrier - FDMA)
Save terminal’s cost & power consumption
Lower PAPR modulation technology: DFT-S-OFDM,
which is similar to OFDM
Higher spectral efficiency compare with traditional
single carrier technology.
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Downlink PRB Parameters
Configuration NSCRB NSymb
DL
Normal Cyclic Prefix ∆f = 15kHz 12
7
Extended Cyclic
Prefix ∆f = 15kHz 6
∆f = 7.5kHz 24 3
0
OFDM Symbols (= 7 for Normal CP)
21 3 4 5 6
NsymbDL
16014
4
14
4
14
4
14
4
14
4
14
42048 2048 2048 2048 2048 2048 2048
Larger first CP when
Normal CP is configured
E.g. NCP = 144,
TCP= 144 x Ts = 4.6875µs
• Normal CP Configuration
Page 32
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
OFDM Symbol Mapping
Time
Frequency
Amplitude
OFDM
Symbol
Cyclic
Prefix
Modulated
OFDM
Symbol
OFDMA
Each user allocated a
different resource
which can vary in time
and frequency.
Page 33
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Basically LTE uses shared-channel transmission, similar to HSDPA,
the time-frequency resource is dynamically shared between users
LTE can take channel variations into account not only in the time
domain, as HSPA, but also in the frequency domain
For LTE, scheduling decisions can be taken as often as once every
1 ms and the granularity in the frequency domain is 180 kHz
Page 34
Channel-dependent scheduling
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Multi-Antenna Technique — MIMO
Fundamentals of MIMO:
The data to be sent will be divided into multiple concurrent data streams.
The data streams are simultaneously transmitted from multiple antennas
through the spatial dimensions, through different radio channels, and
received by multiple antennas.
And then can be restored to the original data according to the spatial
signature of each data stream.
Receive diversity:
SIMO
Transmit diversity:
MISO
Multi-antenna reception
and transmission: MIMO
Page 35
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
2x2 MIMO
eNodeB
UE 1
1x2 SIMO
eNodeB
UE 1
Th
roug
hp
ut
(Mb
ps)
28.34%
18.15%
ISD:500m
Speed:3km/h
13.88
16.4
9.42
12.09
12.36
14.23
15.12%
MIMO
SIMO xx.xx%: Gain
ISD:500m
Speed:30km/h
ISD:1732m
Speed:30km/h
Th
roug
hp
ut
(Mb
ps)
46.40% 46.94%
Outdoor-to-Indoor
Speed: 3km/h
23.24
34.15
56.68%
MIMO SIMO xx.xx%: Gain
24.03
35.18
17.15
26.87
Outdoor-to-Outdoor
Speed: 3km/h
Outdoor-to-Outdoor
Speed: 30km/h
In typical urban area:
15%~28% gain over SIMO @ Macro
~50% gain over SIMO @ Micro
L
T
E
L
T
E
L
T
E
Macr
o
Micro
MIMO--the Key to Improve Cell Throughput
Page 36
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
More Gains through Higher-order MIMO
23%~90% increasing in edge user
throughput
4x4 MIMO v.s. 2x2 MIMO:
~ 50% gain in average cell
throughput
23%~90% increasing in edge user
throughput
2x4 MU-MIMO v.s. 1x2 SIMO:
~50% gain in average cell
throughput
eNodeB
UE 1
UE 1
UE 2
eNodeB
UL 2×4 MU-MIMO DL 4×4 MIMO
Page 37
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
35pt
Font to be used by customers and
partners :
18pt
Font to be used by customers and
partners :
Page38
AMC & 64QAM
• AMC, Adaptive Modulation and Coding
Radio-link data rate is controlled by adjusting the modulation scheme and/or the
channel coding rate
Modulations: QPSK, 16QAM, and 64QAM
Turbo code
Provide higher-data-rate services
Significantly improve the system
throughput
Improve user’s experience
High-order modulation scheme used
within excellent channel condition
Features
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
By restricting the transmission power of parts of the spectrum in
one cell, the interference seen in the neighbouring cells in this part
of the spectrum will be reduced, This part of the spectrum can then
be used to provide higher data rates for users in the neighbouring
cell
Page 39
Inter-cell interference coordination
2
3
6
5
7
4
2
3
5
9
1 1
4
7
8
6
Frequency
Cell 1,4,7 Power
Frequency
Cell 2,5,8 Power
Frequency
Cell 3,6,9
Power
Different subband allocated for different cell edge users among cells
Reducing the DL inter-cell interference among neighbor cells
30~50% throughput increased for cell edge users (<50% load)
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
35pt
32pt
) :18pt
Page 40
LTE Key Technologies -SON
Self-Optiz. & Maintenance
Network Performance
Improvement Network Planning
& Design
Installation &
Initial Tuning
Network Operation &
Maintenance Network Upgrade
and evolution
Self-Planning Self-Config. Self-optimiz.
Deployment Stage
Operation & Maintenance Stage
eNB 3
eNB 1
eNB 2
Self-Organising Network (SON)
•SON effectively reduces human intervention in deployment and operation stage. Thus, SON saves both CAPEX & OPEX.
•SON with ICIC : SON helps inter-cell interference coordination to improve cell edge throughput and user experience
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
SON Improving Operation Efficiency
Planning
Phase
Deploymen
t
Phase
Maintenance
Phase Optimization
Phase
Inventory Management
Sleeping Cell detection
Antenna Fault Detection
Cell/interface/sub. trace
Automatic Network Planning
Automatic Config. Planning
Automatic Parameter Planning
Automatic PCI/TA Optimization
Automatic Neighbor Relation
Inter-RAT ANR,MRO, System Load
Balance, RACH Optimization
Self- configuration (Plug & Play)
Auto Software Management
SON makes LTE network more efficient and solves new challenges when network architecture changes
Page 41
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
35pt
32pt
) :18pt
Copyright @ 2010 Huawei Technologies Co.,Ltd. All rights reserved
Typical SON Features at Initial Stage
MLB: Mobility Load Balancing
ANR: Automatic Neighbor
Relation
Self-Config.: Quick Deployment
• Save cost & Improve exactness
• Avoid first HO failure due to missing neighbor
relation
New
• Optimizing cell reselection and handover
parameters
• Reduce call drop rate, handover failure rate,
• Reduce unnecessary redirection
MRO: Mobility Robust
Optimization
unnecessary HO Rate
HO successful rate
Va
lue
eNodeB
EMS + DHCP
File Server
Config Config
Config
S/W
Config S/W
• More reliable
• Improve network KPI by HO optimization
• Plug & Play Installation
• Shorten deployment duration
Cell A Cell B Cell C
Cell C Cell B Cell A
Cell B
Page 42
Thank you www.huawei.com