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英文标题 :40-47pt
副标题 :26-30pt
字体颜色 : 反白内部使用字体 :
FrutigerNext LT Medium
外部使用字体 : Arial
中文标题 :35-47pt
字体 : 黑体 副标题 :24-28pt
字体颜色 : 反白字体 : 细黑体
LTE System Overview
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Objectives
Upon completion of this course, you will be able to:
Describe LTE development and features
Outline LTE network architecture
Explain LTE key technologies
Describe LTE protocol and channel
Describe LTE deployment
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Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
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Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page6
Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
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3G Long Term Evolution--LTE
Year 2002 20042003 2005 2006 2007 2008 2009 2010 2011 2012 or later
3G-WCDMA in R99/R4
HSPA in R5/R6
LTE in R8
GPRS/EDGE
DL: ~384KbpsUL: ~384Kbps
DL: ~14.4MbpsUL: ~5.76Mbps
DL: ~42MbpsUL: ~11Mbps
DL: ~141MbpsUL: ~50Mbps
DL: ~144-360KbpsUL: ~144-360Kbps
HSPA+ in R7/R8~100 ms
~100 ms
~70 ms
~70 ms
~150 ms
~150 ms
~45 ms
~45 ms
~20ms
~20ms
•LTE is the next step in the evolution of 3GPP Radio Interfaces to deliver “Global Mobile Broadband”.
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Drivers for LTE There are at least three major key drivers for LTE mobile
broadband networks:
Demand for higher data-rates
increasing device capabilities, growing mobile data consumption
New spectrum allocation
Maintaining operator profitability while continued cost
reduction and competitiveness.
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Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
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LTE Network Architecture E-UTRAN (Evolved Universal Terrestrial Radio Access
Network)
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LTE/SAE Network Architecture - cont.
SGSN
GPRSGPRS
UMTSUMTS
E-UTRANE-UTRAN
cdma2000cdma2000
MME
HSS PCRF
Serving GW PDN GW
BTS BSC/PCU
NodeB RNC
eNodeB
S2a
S1-U
S6a
Gx
S5/8
Gb
Iu
S1-MMES12
S3
S4S11
SGi
S9S10
User planeControl plane
BTS
Internet
CorporateInternet
Operator ServiceNetwork
EPS (Evolved Packet System)
S6d
PDSNBSC
SAE
A10/A11
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Contents
1. LTE System Overview
1.1 LTE Development
1.2 LTE Network Architecture
1.3 LTE Operating Bands and Channel Bandwidths
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LTE Operating Bands
LTE supports both FDD mode and TDD mode.
3GPP defines many bands for LTE.
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LTE Channel Bandwidths
LTE must support the international wireless market and
regional spectrum regulations and spectrum availability. To
this end the specifications include variable channel
bandwidths selectable from 1.4 to 20 MHz, with subcarrier
spacing of 15 kHz.
Channel bandwidth BWChannel [MHz] 1.4 3 5 10 15 20
Transmission bandwidth
configuration NRB
6 15 25 50 75 100
NRB is the number of resource blocks
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Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
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LTE Key Technologies
OFDMA: Orthogonal frequency division multiple
access
SC-FDMA: Single carrier-frequency division
multiple access
MIMO: Multiple input multiple output
64QAM
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Multiple access technology in the downlink: OFDM and OFDMA OFDMA is used as multiple access technology in downlink.
OFDMA is a variant of orthogonal frequency division multiplexing (OFDM), a digital multi-carrier modulation scheme.
OFDM signal represented in frequency and time
…
S u b -c a r r ie rsF F T
T im e
S y m b o ls
5 M H z B a n d w id th
G u a rd I n te rv a ls
…
F r e q u e n c y
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Multiple access technology in the downlink: OFDM and OFDMA (cont.) OFMDA incorporates elements of time division multiple
access (TDMA).
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Downlink OFDM Implementation
P/SIFFTS/Ps(t)Add
CyclicPrefix
Tx. filter: G T()
Channel: H()
n(t)
S/PFFTP/Sr(t)RemoveCyclicPrefix
Rx. filter: G T()
Transmitter
Receiver
Channel
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Downlink OFDM Implementation (cont.)
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Multiple access technology in the uplink: SC-FDMA The high peak-to-average ratio (PAR) associated with
OFDM led 3GPP to look for a different transmission scheme for the LTE uplink.
SC-FDMA is used in uplink as multiple access technology.
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Comparison of OFDMA and SC-FDMA
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Overview of MIMO
MIMO: Multiple Input Multiple Output
Transmitter ReceiverWireless Channel
Wireless Channel
… …
N M
Channel Condition Feedback
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What can MIMO provide?
Here is a example for 2*2 MIMO.
Transmitter ReceiverWireless Channel
Wireless Channel
Channel Condition Feedback
Data Stream 1
Data Stream 2
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LTE Multiple Antenna Scheme
In downlink LTE can use 2*2 or higher order MIMO to
increase date rate.
In uplink MU-MIMO (multi-user MIMO) can be used to
double uplink capacity.
With MU-MIMO the uplink peak data rate of single user can not
be doubled.
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AMC & 64QAM AMC, Adaptive Modulation and Coding
the radio-link data rate is controlled by adjusting the
modulation scheme and/or the channel coding rate
DL/UL modulations: QPSK, 16QAM, and 64QAM
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Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
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Contents
3. LTE Protocol Stacks and Channels
3.1 LTE Protocol Stacks
3.2 LTE Channels
3.3 LTE Radio Frame
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Functional Split between E-UTRAN and EPC
internet
eNB
RB Control
Connection Mobility Cont.
eNB MeasurementConfiguration & Provision
Dynamic Resource Allocation (Scheduler)
PDCP
PHY
MME
S-GW
S1MAC
Inter Cell RRM
Radio Admission Control
RLC
E-UTRAN EPC
RRC
Mobility Anchoring
EPS Bearer Control
Idle State Mobility Handling
NAS Security
P-GW
UE IP address allocation
Packet Filtering
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Radio Interface Protocol Architecture
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eNB
PHY
UE
PHY
MAC
RLC
MAC
PDCPPDCP
RLC
eNB
PHY
UE
PHY
MAC
RLC
MAC
MME
RLC
NAS NAS
RRC RRC
PDCP PDCP
User-plane protocol stack Control-plane protocol stack
Radio Interface Protocol Architecture (cont.)
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LTE Physical Channel DL
Physical Broadcast Channel (PBCH)
Physical Control Format Indicator Channel (PCFICH)
Physical Downlink Control Channel (PDCCH)
Physical Hybrid ARQ Indicator Channel (PHICH)
Physical Downlink Shared Channel (PDSCH)
Physical Multicast Channel (PMCH)
UL Physical Uplink Control Channel (PUCCH)
Physical Uplink Shared Channel (PUSCH)
Physical Random Access Channel (PRACH)
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LTE Transport Channel Physical layer transport channels offer information transfer to
medium access control (MAC) and higher layers
DL
Broadcast Channel (BCH)
Downlink Shared Channel (DL-SCH)
Paging Channel (PCH)
Multicast Channel (MCH)
UL
Uplink Shared Channel (UL-SCH)
Random Access Channel (RACH)
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LTE Logical Channel Logical channels are offered by the MAC layer
Control Channels: Control-plane information Broadcast Control Channel (BCCH)
Paging Control Channel (PCCH)
Dedicated Control Channel (DCCH)
Multicast Control Channel (MCCH Dedicated Control Channel)
Common Control Channel (CCCH)
Traffic Channels: User-plane information Dedicated Traffic Channel (DTCH): transmission of all uplink
and non-MBMS downlink user data
Multicast Traffic Channel (MTCH): transmission of MBMS services
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Channel Mappings
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Frame Structure FDD frame structure
TDD frame structure
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Resource Grid
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Bandwidth Configuration
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Contents
1. LTE System Overview
2. LTE Key Technologies
3. LTE Protocol and Channels
4. LTE Deployment
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LTE SAE
LTE Network Composition
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LTE Network Transport
eNB
SAE GW/PDN GW
FE/GE
IP/Ethernet Network
IP/Ethernet Network
FE/GE
• 100/1000Base-T, RJ45• 100Base-FX/1000Base-X, SM or MM Fiber, SFP-based connector
eNB eNB
eNB
FE/GE FE/GE
FE/GE
eNBLegacy 2G/3G
FE/GE
IPMACPHY
eNB Daisy-chaining with integrated IP switching
Co-transmission with legacy 2G/3G
FE/GE o/e
FE/GE
RNC/BSC
eNB
FE/GE
BTS/Node B
Co-transmission for Multi-mode base station
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eNodeB 3900 Series
Modularization
RRU/RFU
BBU
eNB
uniNodeB
1
2
3 Platform
GSM/TD-SCDMA/WCDMA/CDMA/LTE Unified All-IP Base Station Architecture
Modularization
Using BBU plus RRU and RFU leads to a flexible configuration for Distributed and Macro.
Multimode
Modularization Supports Different Modes
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Smooth evolution to LTE
Investment protection while evolving from GSM/UMTS to LTE Radio units for GSM/UMTS and LTE are inter-changeable in the same frequency band
Baseband boards in multi-mode BBU are inter-changeable between GSM/UMTS and LTE
LTE Card
LTE (100M/50M)LTE (100M/50M)
Same band Different band
Same band Different band
GSM/HSPA(+)/LTE RRU LTE RRU
GSM/HSPA(+)/LTE RFU LTE RFU
LTE Card
GSM / UMTS / HSPA(14.4M/5.76M) / HSPA+(28M/11.5M)
GSM / UMTS / HSPA(14.4M/5.76M) / HSPA+(28M/11.5M)
BBU
RRU
Cabinet-based Node B
BBU
Software upgrade
Software upgrade
Adding LTE RRU
Adding LTE RFU BBU
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Flexible evolution for Cabinet NodeB
GSM
GSM
GSM
GSM&UMTS operator
UMTS roll out will reduce GSM expansion investment at hot spot
Operator issue New business ALL IP service
GSM for Voice
HSPA/LTE for Data network
GSM update/rollout
GSM
GSM
GSM
GSM
GSM
GSM
UMTS/HSPA
rollout
U+H
U+H
U+H
UMTS/HSPA + GSM
U+H
U+H
U+H
U+H
U+H
U+H
LTE
LTE
LTE
UMTS/HSPA + LTE convergence
GSM + LTE Data network convergence
GSM
GSM
GSM
LTE
LTE
LTE
LTE
LTE
LTE
LTE
LTE
LTE
LTE
UMTS<E operator
LTE for high speed mobile broadband
Reuse GSM frequency resource for LTE
LTE for mobile broadband
Operator issue New business ALL IP service
GSM
GSM
GSM
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Summary Standardization in the form of 3GPP Release 8
Support for both FDD and TDD.
Flexible spectrum allocation (1.4 ~ 20 MHz).
IP-based flat network architecture
Multicarrier-based radio air interface
OFDMA and SC-FDMA
Multi-input multi-output (MIMO)
Adaptive modulation and coding
DL modulations: QPSK, 16QAM, and 64QAM
UL modulations: QPSK and 16QAM
ARQ within RLC sublayer and Hybrid ARQ within MAC sublayer
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LTE Standard Specifications
Freely downloadable from
http://www.3gpp.org/ftp/Specs/archive/36_series/
Thank youwww.huawei.com
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