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© 2012 Agilent Technologies LTE-Advanced Design and Test Challenges - Carrier Aggregation Presented by: Martha Zemede, Agilent Technologies

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© 2012 Agilent Technologies

LTE-Advanced Design and Test Challenges - Carrier Aggregation

Presented by: Martha Zemede, Agilent Technologies

© 2012 Agilent Technologies 2

© 2012 Agilent Technologies

Agenda

• Overview of carrier aggregation

– Carrier aggregation modes

– Operating bands

– Cell configuration

– Deployment scenarios

– Layer 1 and 2 structure

– Resource scheduling

• Design challenges

• Test challenges

• Agilent solutions

• Resources

© 2012 Agilent Technologies 3

© 2012 Agilent Technologies

Release 10 and Beyond Proposals

Radio aspects

1. Carrier aggregation

2. Enhanced uplink multiple access

a) Clustered SC-FDMA

b) Simultaneous Control and Data

3. Enhanced multiple antenna transmission

a) Downlink 8 antennas, 8 streams

b) Uplink 4 antennas, 4 streams

4. Coordinated Multipoint (CoMP)

5. Relaying

6. Home eNB mobility enhancements

7. Customer Premises Equipment

8. Heterogeneous network support

9. Self Optimizing networks (SON)

Rel 10 LTE-A

proposed to ITU

Other Release 10

and beyond

© 2012 Agilent Technologies 4

© 2012 Agilent Technologies

What is Carrier Aggregation?

• Extends the maximum transmission bandwidth, up to 100 MHz, by aggregating up to five LTE

carriers – also known as component carriers (CCs)

• Lack of sufficient contiguous spectrum forces use of carrier aggregation to meet peak data

rate targets:

– 1 Gbps in the downlink and 500 Mbps in the uplink

• Motivation:

– Achieve wide bandwidth transmissions

– Facilitate efficient use of fragmented spectrum

– Efficient interference management for control channels in heterogeneous networks

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© 2012 Agilent Technologies 5

© 2012 Agilent Technologies

Band A Band B

Carrier Aggregation Modes

Intra -band

contiguous

allocation

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Intra-band

non-contiguous

allocation

Inter-band

non-contiguous

allocation

Component Carrier (CC)–up to 20 MHz BW

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Band A

Band A

© 2012 Agilent Technologies 6

© 2012 Agilent Technologies

Carrier Aggregation for Release 10

• Backward compatible with LTE Release 8 / 9

– Each component carrier (CC) appears as Release

8/9 carrier to LTE UE

– Can be operated stand-alone as a single carrier or

as part of carrier aggregation

• Deployment will be limited to the use of two CCs;

signalling supports up to 5 CCs

• FDD downlink

– Supports both intra-band contiguous and inter-band

aggregation

• TDD downlink

– Supports intra-band contiguous aggregation

• FDD & TDD uplink

– Supports intra-band contiguous aggregation

PUSCH PUSCH

PUCCH

Frequency

Example of contiguous

aggregation of two uplink CCs

© 2012 Agilent Technologies 7

© 2012 Agilent Technologies

Carrier Aggregation –

Operating Bands for Release 10

• Intra-band contiguous CA:

– Bands 1 and 40 are supported:

• 15 and 20 MHz carrier bandwidths for Band 1

• 10, 15 and 20 MHz bandwidth in Band 40

Band E-UTRA

BandUplink (UL) operating band Downlink (DL) operating band Duplex

ModeBS receive / UE transmit BS transmit / UE receive

FUL_low – FUL_high FDL_low – FDL_high

CA_1 1 1920 MHz – 1980 MHz 2110 MHz – 2170 MHz FDD

CA_40 40 2300 MHz – 2400 MHz 2300 MHz – 2400 MHz TDD

Band E-UTRA

BandUplink (UL) operating band Downlink (DL) operating band Duplex

ModeBS receive / UE transmit BS transmit / UE receive

FUL_low – FUL_high FDL_low – FDL_high

CA_1-51 1920 MHz – 1980 MHz 2110 MHz – 2170 MHz

FDD5 824 MHz – 849 MHz 869 MHz – 894 MHz

• Inter-band non-contiguous CA:

– Bands 1 and 5 for 10 MHz CCs, one CC per band

© 2012 Agilent Technologies 8

© 2012 Agilent Technologies

Rel-11 Carrier Aggregation Combinations

Band Lead company Uplink Downlink Uplink Downlink Mode

CA-B3_B7 TeliaSonera 1710 - 1785 1805 - 1880 2500 - 2570 2620 - 2690 FDD

CA-B4_B17 AT&T 1710 – 1755 2110 - 2155 704 – 716 734 - 746 FDD

CA-B4_B13 Ericsson (Verizon) 1710 – 1755 2110 - 2155 777 - 787 746 - 756 FDD

CA-B4_B12 Cox Communications 1710 – 1755 2110 - 2155 698 – 716 728 - 746 FDD

CA-B20_B7 Huawei (Orange) 832 – 862 791 - 821 2500 - 2570 2620 - 2690 FDD

CA-B2_B17 AT&T 1850 – 1910 1930 - 1990 704 – 716 734 - 746 FDD

CA-B4_B5 AT&T 1710 – 1755 2110 - 2155 824 – 849 869 - 894 FDD

CA-B5_B12 US Cellular 824 – 849 869 - 894 698 – 716 728 - 746 FDD

CA-B5_B17 AT&T 824 – 849 869 - 894 704 – 716 734 - 746 FDD

CA-B20_B3 Vodafone 832 – 862 791 - 821 1710 - 1785 1805 - 1880 FDD

CA-B20_B8 Vodafone 832 – 862 791 - 821 880 – 915 925 - 960 FDD

CA-B3_B5 SK Telecom 1710 - 1785 1805 - 1880 824 – 849 869 - 894 FDD

CA-B7 China Unicom 2500 - 2570 2620 - 2690 2500 - 2570 2620 - 2690 FDD

CA-B1_B7 China Telecomm 1920 - 1980 2110 - 2170 2500 - 2570 2620 - 2690 FDD

CA-B4_B7 Rogers Wireless 1710 – 1755 2110 - 2155 2500 - 2570 2620 - 2690 FDD

CA-B25_25 Sprint 1850 - 1915 1930 - 1995 1850 - 1915 1930 - 1995 FDD

CA-B38 Huawei (CMCC) 2570 - 2620 2570 - 2620 2570 - 2620 2570 - 2620 TDD

CA-B43 Clearwire 3600 - 3800 3600 - 3800 3600 - 3800 3600 - 3800 TDD

© 2012 Agilent Technologies 9

© 2012 Agilent Technologies

Carrier Aggregation-Cell Configuration

• PCell (Primary Serving Cell): handles the RRC connection establishment/re-establishment

– PCC (Primary Component Carriers): uplink and downlink CCs corresponding to the PCell

• SCell (Secondary Serving Cell): configured after connection establishment, to provide additional radio resources

– SCC (Secondary Component Carriers): uplink and downlink CCs corresponding to the SCell

• PCell:

– PDCCH/PDSCH/PUSCH/PUCCH can be transmitted

– Measurement and mobility procedure are based on PCell

– Random access procedure is performed over PCell

– Can not be deactivated

– DL PCell and UL PCell are linked via SIB2

• SCell:

– PDCCH/PDSCH/PUSCH can be transmitted (not PUCCH)

– MAC layer based dynamic activation/deactivation procedure is supported for SCell for UE battery saving

– Can be cross scheduled

SCC SCCPCC

Downlink

PCC SCC

Uplink

Examples of primary and secondary

component carriers for uplink and downlink

© 2012 Agilent Technologies 10

© 2012 Agilent Technologies

Carrier Aggregation Deployment Scenarios (1 of 2)

Scenario #2:

• F1 and F2 cells are co-located and overlaid, but F2 has

smaller coverage

• Only F1 provides sufficient coverage and F2 is used to

improve throughput.

• Likely scenario when F1 and F2 are of different bands

F1 F2

Scenario #3:

• F1 and F2 cells are co-located but F2 antennas are

directed to the cell boundaries of F1 so that cell edge

throughput is increased.

• F1 provides sufficient coverage but F2 potentially has

holes

• Likely scenario when F1 and F2 are of different bands

Scenario #1:

• F1 and F2 cells are co-located and overlaid, providing

same coverage.

• Likely scenario when F1 and F2 are of the same band.

© 2012 Agilent Technologies 11

© 2012 Agilent Technologies

Carrier Aggregation Deployment Scenarios (2 of 2)

Scenario #4:

• F1 provides macro coverage and on F2 Remote Radio

Heads (RRHs) are used to improve throughput at hot

spots.

• Likely scenario when F1 and F2 are of different bands,

Scenario #5:

• Similar to scenario #2, but frequency selective

repeaters are deployed to extend coverage for one of

the frequencies.

In Release 10, scenarios 1, 2 & 3 are

supported for UL when F1 & F2 are in same

band. For DL, all scenarios are supported

© 2012 Agilent Technologies 12

© 2012 Agilent Technologies

Layer 2 Structure for Carrier Aggregation

• Data aggregation happens in MAC layer, the multi-carrier nature of carrier aggregation not visible to core network

• The MAC layer divides the data between different CCs and separate HARQ processes for each CC

Segm.

ARQ etc

Multiplexing UE1

Segm.

ARQ etc...

Scheduling / Priority Handling

Logical Channels

Transport Channels

MAC

RLCSegm.

ARQ etc

Segm.

ARQ etc

PDCP

ROHC ROHC ROHC ROHC

Radio Bearers

Security Security Security Security

...

HARQ HARQ...

Multiplexing UEn

HARQ HARQ...

CC1 CCx... CC1 CCy...

Multiplexing

...

Scheduling / Priority Handling

Transport Channels

MAC

RLC

PDCP

Segm.

ARQ etc

Segm.

ARQ etc

Logical Channels

ROHC ROHC

Radio Bearers

Security Security

HARQ HARQ...

CC1 CCx...

Layer 2 Structure for the UL (3GPP TR 36.912 V10.0.0, Figure 5.2.1-2)

Layer 2 Structure for the DL(3GPP TR 36.912 V10.0.0, Figure 5.2.1--1)

Independent

HARQ per CC

Independent

HARQ per CC

© 2012 Agilent Technologies

Channel coding

HARQ

modulation

Resource mapping

CC2

MAC to Physical Layer Mapping for Carrier Aggregation

• There is one transport block, up to two in case of spatial multiplexing, and one HARQ entity

per scheduled component carrier

• A UE can be scheduled over multiple component carriers simultaneously, but one random

access procedure at any time

Channel coding

HARQ

modulation

Resource mapping

CC1

One UE

TrBlk 1 TrBlk 2

….

© 2012 Agilent Technologies 14

© 2012 Agilent Technologies

Resource Scheduling

Downlink Control Signaling

• Resources can be assigned to a UE in two ways:

– Same-carrier scheduling – separate PDCCH for each CC

• Reusing Release 8/9 PDCCH structure and DCI formats

– Cross-carrier scheduling – common PDCCH for multiple

CCs.

• Reusing Release 8 /9 PDCCH structure

• New 3-bit Carrier Indicator Field (CIF) added to Release 8

DCI

• Main motivation:

– Load balancing

– Interference management for control channels in

heterogeneous networks

• PCell can not be cross scheduled, it is always scheduled

through its own PDCCH

PD

CC

H

PDSCHCC1:

PCell

PD

CC

H

PDSCHCC1:

PCell

PDSCH scheduled by

PDCCH from PCell

CC2:

SCell

1 ms subframe

Cross-carrier scheduling

(3-bit CIF included in DCI)

1 ms subframe

Same-carrier scheduling

© 2012 Agilent Technologies 15

© 2012 Agilent Technologies

Macro Cell

Pico CellCC1

for Macro Cell

CC2

for Macro Cell

CC2

Low Power

CC1

Low Power

Cross-Carrier Scheduling:Interference management for control channels in heterogeneous networks

• Cross-carrier scheduling provides

interference management for

control channels known as Inter-

Cell Interference Coordination

(ICIC) for PDCCH.

• In this example, CC1 of Macro Cell

would cause high interference to

CC1 of pico cell, therefore pico cell

uses CC2 for PDCCH messages to

schedule PDSCH transmission on

CC1

• Macro cell uses CC1 to schedule

PDSCH transmission on both CC1

and CC2

PD

CC

H

PDSCH

PDSCH scheduled by

PDCCH from CC1

Macro Cell

PD

CC

H

PDSCH

PDSCH scheduled by

PDCCH from CC2

Pico Cell

CC1

CC2

CC1

CC2

Cross-carrier scheduling

avoids control

channel interference

© 2012 Agilent Technologies 16

© 2012 Agilent Technologies

Updates to Uplink Control Signaling

• Uplink control signaling must be extended to work

across multiple carriers

– Release 8 PUCCH was not designed to carry

large numbers of ACK/NACK bits

• PUCCH format 1b with “channel selection” for up

to 4 ACK/NACK bits, 2 CCs

– Similar way to Release 8 TDD

• New PUCCH format 3 for full range of ACK/NACK

– Transmits large number of ACK/NACK bits:

• Up to 10 ACK/NACK bits for FDD

• Up to 20 ACK/NACK bits for TDD

– Not based on Zadoff-Chu sequences, uses

similar to PUSCH transmissions (DFT-S-OFDM)

– QPSK modulation

PUCCH:

uplink control

© 2012 Agilent Technologies 17

© 2012 Agilent Technologies

Agenda

• Overview of carrier aggregation

– Carrier aggregation modes

– Operating bands

– Cell configuration

– Deployment scenarios

– Layer 1 and 2 structure

– Resource scheduling

• Design challenges

• Test challenges

• Agilent solutions

• Resources

© 2012 Agilent Technologies 18

© 2012 Agilent Technologies

UE Transmitter Architecture for Various

Intra-Band Aggregation Scenarios

RF PA

RF filter

Multiplex

1 and 2 BB

D/AIFFT

L1

Single (baseband + IFFT + DAC + mixer + PA)

Aggregation Scenario: Intra-band contiguous

Multiplex

1 BB

Multiplex

2 BB

IFFT

IFFT

D/A

D/A

L1

RF PA

L2

RF filter

Multiple (baseband + IFFT + DAC), single (stage-1 IF mixer

+ combiner @ IF + stage-2 RF mixer + PA)

Aggregation Scenarios: Intra-band contiguous and non-

contiguous

Multiplex

1 BB

Multiplex

2 BB

IFFT

IFFT

D/A

D/A

RF PARF filter

L2

L1

Multiple (baseband + IFFT + DAC + mixer), low-

power combiner @ RF, and single PA

Aggregation Scenarios: Intra-band contiguous

and non-contiguous

Scenario A

Scenario B

Scenario C

Reference: 3GPP TR 36.912 v.10.0.0. Figure 11.3.2.1-1

© 2012 Agilent Technologies 19

© 2012 Agilent Technologies

UE Receiver Architecture

Rx Characteristics

Option Description (Rx

architecture)

Intra Band aggregation Inter Band

aggregation

Contiguous

(CC)

Non

contiguous

(CC)

Non

contiguous

(CC)

ASingle (RF + FFT +

baseband) with

BW>20MHz

Yes

BMultiple (RF + FFT

+ baseband) with

BW≤20MHz

Yes Yes Yes

Option A

Single wideband-capable (i.e., >20MHz) RF front end (i.e., mixer, AGC, ADC) and a single FFT, or

alternatively multiple "legacy" RF front ends (<=20MHz) and FFT engines.

Option B

In the case non adjacent Inter band separate RF front end are necessary.

Reference: 3GPP TR 36.912 v.10.0.0.

© 2012 Agilent Technologies 20

© 2012 Agilent Technologies

SystemVue LTE-Advanced

Carrier Aggregation

Scenario number

Deployment scenarioTransmission BWs of LTE-A carriers

# of LTE-A component carriersBands for LTE-A

carriersDuplex modes

1Single-band contiguous spec. alloc. @ 3.5GHz band for FDD

UL: 40 MHz

DL: 80 MHz

UL: Contiguous 2x20 MHz CCsDL: Contiguous 4x20 MHz CCs

3.5 GHz band FDD

2Single-band contiguous spec. alloc. @ Band 40 for TDD

100 MHz Contiguous 5x20 MHz CCsBand 40

(2.3 GHz)TDD

4

Single-band, non-contiguous spec. alloc. @ 3.5GHz band for FDD

UL: 40 MHz

DL: 80 MHz

UL: Non-contiguous 1x20 + 1x20 MHz CCsDL: Non-contiguous 2x20 + 2x20 MHz CCs

3.5 GHz band FDD

Re

Im

Env

1 1 0 1 0

1 1 0 1 0

UE1_Dat a

HARQ _Bit s

f r m _TD

f r m _FD

UE1_M odSym bols

UE1_ChannelBit s

SC_St at usUE1_PM I

LTE_A

DL

Src

UEs_n_SCID=0;0;0;0;0;0 [[0, 0, 0, 0, 0, 0]]

UserDefinedAntMappingMatrix=NO

LTE_A_DL_Src_2

FcChange

Spect rum Anal yzer

CCDF

Stop=10ms

Start=0s

CCDF_CA

CCDF

Stop=10ms

Start=0s

WoCA

ModOUT

QUAD

OUT

Freq

Phas e

Q

I

Am p

Re

Im1 1 0 1 0

1 1 0 1 0

UE1_Dat a

HARQ _Bit s

f r m _TD

f r m _FD

UE1_M odSym bols

UE1_ChannelBit s

SC_St at us

UE1_PM I

LTE_A

DL

Src

UEs_n_SCID=0;0;0;0;0;0 [[0, 0, 0, 0, 0, 0]]

UserDefinedAntMappingMatrix=NO

LTE_A_DL_Src_4

ModOUT

QUAD

OUT

Freq

Phas e

Q

I

Am p

Re

Im

1 1 0 1 0

1 1 0 1 0

UE1_Dat a

HARQ _Bit s

f r m _TD

f r m _FD

UE1_M odSym bols

UE1_ChannelBit s

SC_St at usUE1_PM I

LTE_A

DL

Src

UEs_n_SCID=0;0;0;0;0;0 [[0, 0, 0, 0, 0, 0]]

UserDefinedAntMappingMatrix=NO

LTE_A_DL_Src_3

ModOUT

QUAD

OUT

Freq

Phas e

Q

I

Am p

Re

Im

ModOUT

QUAD

OUT

Freq

Phas e

Q

I

Am p

1 1 0 1 0

1 1 0 1 0

UE1_Dat a

HARQ _Bit s

f r m _TD

f r m _FD

UE1_M odSym bols

UE1_ChannelBit s

SC_St at us

UE1_PM I

LTE_A

DL

Src

UEs_n_SCID=0;0;0;0;0;0 [[0, 0, 0, 0, 0, 0]]

UserDefinedAntMappingMatrix=NO

LTE_A_DL_Src_1

20MHzCCs

© 2012 Agilent Technologies 21

© 2012 Agilent Technologies

Design Challenges – Intra-Band CA

• Several technical challenges, especially for a

UE

• From RF perspective, intra-band contiguous

aggregated carriers have similar properties as a

corresponding wider carrier being transmitted

and received.

• Release 10 requires more stringent linearity

requirements on the power amplifier than

Release 8/9

– UE will need to use less transmitter power for

the amplifier to remain in the linear region

• Use of multiple CC on UL should be optional

and only used for cases where UEs are not at

the cell edge.

• For the base station, it has less impact - it

corresponds in practice to multi-carrier

configuration already supported in earlier

releases.

Example of CCDF plot using N7624B LTE/LTE-

Advanced Signal Studio software

2 uplink contiguous CCs

Single uplink CC

© 2012 Agilent Technologies 22

© 2012 Agilent Technologies

Design Challenges – Inter-Band CA

• Major challenge for the UE

– Multiple simultaneous receive chains

– Multiple simultaneous transmit chains

• Challenging radio environment in terms of intermodulation and cross-modulation within

the UE device

– Need to design front-end components that help reduce harmonics, and other

intermodulation products, which meet 3GPP requirements.

• Simultaneous transmit or receive with mandatory MIMO support add significantly to the

challenge of antenna design

• For the base station it has less impact – similar to current base stations supporting

multiple bands.

Multiplex

1 BB

Multiplex

2 BB

IFFT

IFFT

D/A

D/ARF PA RF filterL2

L1RF PA

RF filter

RF filter

Multiple (baseband + IFFT + DAC +

mixer + PA), high-power combiner to

single antenna OR dual antenna (MIMO)

Reference: 3GPP TR 36.912 v.10.0.0. Figure 11.3.2.1-1

© 2012 Agilent Technologies 23

© 2012 Agilent Technologies

Agenda

• Overview of carrier aggregation

– Carrier aggregation modes

– Operating bands

– Cell configuration

– Deployment scenarios

– Layer 1 and 2 structure

– Resource scheduling

• Design challenges

• Test challenges

• Agilent solutions

• Resources

© 2012 Agilent Technologies 24

© 2012 Agilent Technologies

Test Challenges:

Power Amplifier Characterization

Agilent Solution:

• Signal Studio software generates LTE-

Advanced downlink and uplink signals to

test power and modulation

characteristics of components and

transmitters.

• Supports up to 5 component carriers

within up to 160 MHz I/Q bandwidth with

MXG vector signal generator

• Investigate effects of carrier aggregation

on components including PAR and CCDF

Test Challenge: Characterizing the LTE-Advanced UE or eNB power amplifier presents

RF challenge. The different carrier aggregation configurations will stress the amplifier in

different ways since each will have different peak-to-average ratios.

Configure up to

5 component

carriers

© 2012 Agilent Technologies 25

© 2012 Agilent Technologies

SystemVue LTE-Advanced

Carrier Aggregation

Scenario Link ConfigurationPAPR of single CC,

before aggregation

PAPR with CCs,

after aggregation

Scenario 1 FDD DL 4x20 MHz CCs 8.45 dB 9.98 dB

Scenario 2 TDD DL 5x20 MHz CCs 9.17 dB 11.71 dB

Scenario 4

FDD DL 2x20+2x20MHz 8.38 dB 9.58 dB

FDD UL 20 + 20MHz 5.79 dB 6.86 dB

Scenario 1 FDD DL

Scenario 2

TDD DL

Scenario 4 FDD DL Scenario 4 FDD UL

© 2012 Agilent Technologies 26

© 2012 Agilent Technologies

Test Challenges: Analyze the Multiple

Transmit and Receive Chains Simultaneously

Agilent Solutions:

89600 VSA software

Inter-band and intra-band carrier

aggregation support for both uplink and

downlink, FDD and TDD

Hardware: X-Series signal analyzers

or N7109A multi-channel signal

analyzer

Two component carriers at

800 MHz

One component

carrier at 2100 MHz

Test Challenge: For Release 10, the multiple component carriers must arrive at the

receiver at the same time, time alignment error of 1.3 µs for inter-band and 130 ns for

intra-band. This requires simultaneous demodulation of the multiple component carriers

© 2012 Agilent Technologies 27

© 2012 Agilent Technologies

LTE-Advanced Signal Analysis: 89600 VSA

Carrier Aggregation

• FDD and TDD per 3GPP Release 10

• Inter-band and intra-band for UL and DL

• Analyze up to five component carriers (CCs)

simultaneously:

– Up to 160 MHz analysis bandwidth on PXA

for intra-band CA

– Multi-channel signal analyzer for inter-band

CA

– Independent measurement setup, including

varying bandwidths, for individual CCs

– Rich selection of EVM measurements plus

CCDF, freq response and more

• Strenuous in-band and out-of-band spurious

and interference testing is possible with

PXA’s industry best RF performance

© 2012 Agilent Technologies 28

© 2012 Agilent Technologies

89600 VSA: Setting up the LTE-Advanced Demodulator

Measurement example for setting up

component carriers, including:

FDD / TDD

UL / DL

Bandwidth & span

Sync type

Up to 5 component carriers,

both inter-band and intra-band

configuration.

© 2012 Agilent Technologies 29

© 2012 Agilent Technologies

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Inter-Band Carrier Aggregation Analysis

Band A Band B

N7109A

OR

Test Challenge: Demodulating inter-band carrier aggregated signals require signal analyzer

with bandwidth that spans multiple frequency bands (ex. 800 MHz and 2100 MHz)

•10 MHz Freq ref.

•Time sync

CC from

“Band A”

CC from

“Band B”

Dual signal analyzer

Agilent’s Unique Solution:

Dual input hardware, fully synchronized , plus 89600 VSA software. VSA software acquires

all the CCs simultaneously, demodulate the captured signals, and analyze them all

simultaneously

Two CCs at 800 MHz Three CCs at 2100 MHz

© 2012 Agilent Technologies 30

© 2012 Agilent Technologies

Inter-Band Carrier Aggregation Analysis

Allocated resources per component carrier

Constellation diagram per component carrier

Spectrum of two CCs at 800 MHz

Frame summary per component carrier

Spectrum of three CCs at 2100 MHz

© 2012 Agilent Technologies 31

© 2012 Agilent Technologies

Test Challenges: Simultaneous analysis of

Inter-Band Aggregation plus downlink MIMO

Agilent Solutions:• N7109A multi-channel signal analysis

system: 2, 4 or 8 channels, 40 MHz

demodulation BW per channel

• Pick and choose how you want to use

the 8 channels (ex. 4x4 MIMO on two

inter-band component carriers or 2x2

MIMO on four inter-band component

carriers)

Test Challenge: when inter-band carrier aggregation is combined with spatial multiplexing

MIMO, it requires test tools that has a minimum of 4 inputs (two inputs per CC).

Up to 8

channels

MIMO

Info trace

for CC0

MIMO

Info trace

for CC1

Frequency

response

for CC0

Frequency

response

for CC0

Constellation

for CC0

Constellation

for CC1

Example of 2x2 MIMO and inter-band carrier aggregation with two

component carriers

© 2012 Agilent Technologies 32

© 2012 Agilent Technologies

Agenda

• Overview of carrier aggregation

– Carrier aggregation modes

– Operating bands

– Cell configuration

– Deployment scenarios

– Layer 1 and 2 structure

– Resource scheduling

• Design challenges

• Test challenges

• Agilent solutions

• Resources

© 2012 Agilent Technologies 33

© 2012 Agilent Technologies

Agilent LTE and LTE-Advanced Portfolio

Signal

Generators

RDX for

DigRF v4

Systems for RF and

Protocol Conformance

RF Module Development

RF Proto RF Chip/module

Design

Simulation

BTS and Mobile

BB Chipset Development

L1/PHY

FPGA and ASIC

Conformance

RF and BB

Design

Integration

L1/PHYSystem

Design

Validation

System Level

RF Testing

BTS

or

MobileProtocol Development

L2/L3

DigRF v4

Pre-Conformance

Network Deployment

Manufacturing

89600 VSA

SystemVue (BB)

ADS/GG (RF/A)

N5971A IFT

Software

Scopes and

Logic Analyzers

Baseband

Generator and

Channel Emulator

Signal

creation

software

RF Handheld Analyzers

Manufacturing test

platforms

Battery drain

characterization

N6070A LTE signaling

conformance test

RF & Protocol test

platforms

Signal Analyzerswith LTE Measurement Apps

89600 WLA

N7109A Multi-Channel

Signal Analysis

System

© 2012 Agilent Technologies

Summary

• Carrier aggregation is one of the most important features for LTE-

Advanced enabling:

– Higher data rates

– Facilitate efficient use of fragmented spectrum

– Interference management in heterogeneous networks

• It is introduced in LTE Release 10 with deployment of two component

carriers and will be extended with Rel. 11and beyond

• It introduces various design challenges, especially for UE

• Test challenges for multi-carrier EVM requiring simultaneous demodulation

of both inter-band and intra-band signal configurations

• Agilent was first to market with LTE-Advanced solution addressing system

simulation, signal generation and analysis tools

34

© 2012 Agilent Technologies 35

© 2012 Agilent Technologies

For More Information

Agilent Resources

• LTE-Advanced application and product info: www.agilent.com/find/lteadvanced

• 89600 VSA product information: www.agilent.com/find/vsa

• X-Series signal analyzer product information: www.agilent.com/find/xseries

• N7109A multi-channel signal analyzer information: www.agilent.com/find/N7109A

• Signal Studio product information: www.agilent.com/find/signalstudio

Key LTE-Advanced Documents

• Historical documents:

– Study Item RP-080599: ftp://ftp.3gpp.org/tsg_ran/TSG_RAN/TSGR_41/Docs/RP-080599.zip

– Requirements TR 36.913 v9.0.0 (2009-12): ftp://ftp.3gpp.org/Specs/html-info/36913.htm

– Study Phase Technical Report TR 36.912 v9.3.0 (2010-06): ftp://ftp.3gpp.org/Specs/html-

info/36912.htm

• The LTE-A specifications are now drafted in the Release 10 specifications

ftp.3gpp.org/specs/latest/Rel-10/

© 2012 Agilent Technologies

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