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8/11/2019 LTE Radio Interface
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LTE Radio Interface
8/11/2019 LTE Radio Interface
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Introduction
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LTE Radio Interface?
Different from othertechnologies
New structures
Some similarities
eNB ?
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Scope and objectives
Describe OFDM/OFDMA
Describe SC-FDMA
Explain Flexible Spectrum Usage
Explain Hybrid ARQ (HARQ)
Present Radio Interface Structure
Describe Channel Structure
Objectives
Scope
Downlink and Uplink Transmission
Technique
Flexible Spectrum Usage
HARQ
Radio Interface and Channel Structure
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Pre-Test
Pre-test
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TIES
ing, 'Finish' button: Goes to Next Slide
g, 'Finish' button: Goes to Slide
er to leave quiz: After user has completed quiz
y view slides after quiz: At any time
y attempt quiz: Unlimited times
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Click on this button to skip the course
and go to EriColl to register your
attempt.
Click this button to go to the first topic
in the course.
Continue recommendedpathBrowse through thecourse
Browse or Proceed
Make your choice!
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Overview
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8/11/2019 LTE Radio Interface
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LTE Radio Interface
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Downlink transmission technique
FlexiblebandwidthoperationDifferentregions
Differentfrequencybands&bandwidths
eNB
OFDM/OFDMA
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OFDM
Datastream
Subcarrier
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frequency
User #2 scheduledUser #1 scheduled
User #3
scheduled
OFDMA
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110 RB (20 MHz)
Bandwidth flexibility
20 MHz151031.4 5
1.4 MHz
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fDL
fUL
FDD
fDL
fUL
Half-duplex FDD
fDL/UL
TDD
Time-domain structure
-moreoverheadandlatency+radiochannelreciprocity
+simplertodeployinlimited
availablespectrum
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RTIES
sing, 'Finish' button: Goes to Next Slide
ng, 'Finish' button: Goes to Next Slide
ser to leave quiz: At any time
ay view slides after quiz: At any timeay attempt quiz: Unlimited times
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Multi Antenna Possibilities
RX
MIMO
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Segmentation, ARQ
Ciphering
Header Compr.
Hybrid ARQHybrid ARQ
MAC multiplexing
Antenna and resrouce
mapping
Coding + RM
Data modulation
Antenna and resource
mapping
Coding
Modulation
User#1 User#2
Concatenation, ARQ
Deciphering
Header Compr.
Hybrid ARQHybrid ARQ
MAC demultiplexing
Antenna and resrouce
mapping
Coding + RM
Data modulation
Antenna and resource
demapping
Decoding
Demodulation
eNodeB UE
EPS bearers
E-UTRA
Radio Bearers
Logical
Channels
Transport
Channels
Physical
Channels
Radio interface structure
MAC MAC
RLC#1
PHY
RLC
PHY
PDCP#1
PDCP
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PHY
MAC
RLC
PDCPRRC
UE
PHY
MAC
RLC
PDCP
eNB
RRC
NAS NAS
Control PlaneMME
S1-CP
RadiointerfaceControlSignaling
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Receiver process Receiver process
Demultiplexed and forwarded to RLC
Receiver processReceiver processprocessHARQ process
3 72 61 5 9
Datastream
0 4 8
The HARQ Principle
processHARQ process
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RTIES
sing, 'Finish' button: Goes to Next Slide
ng, 'Finish' button: Goes to Next Slide
ser to leave quiz: At any time
ay view slides after quiz: At any timeay attempt quiz: Unlimited times
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Control
Channelstructure
PHY
MAC
RLC
Logical
Channels
Transport
Channels
Physical
Channels/
Signals
Traffic
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Summary
OFDM/OFDMA in DL
SC-FDMA in UL
Six different bandwidths
FDD, TDD and Half-duplex FDD
Multiple antenna solutions Layered interface structure
eNB
OFDM/OFDMA
SC-FDMA
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Quiz