Smart Antennas & Radio Network Planning - · PDF fileSmart Antennas & Radio Network Planning ... acquisition problems in high data rate 3G systems ... • Enhanced Smart Antenna radio

Thomas NeubauerJune 12, 2002

INSTITUT FÜRNACHRICHTENTECHNIK UNDHOCHFREQUENZTECHNIK

Smart Antennas & Radio Network Planning

“Challenges and Solutions for 3G“

Thomas Neubauer

Vienna University of Technology Institut für Nachrichtentechnik und Hochfrequenztechnik

www.nt.tuwien.ac.at/mobile



7th LS Seminar DaySlide 2

Outline

Motivation– Investor´s Perspective– Public Protests against Mobile Masts– Time Perspective

Smart Antenna OverviewSmart Antenna Planning ChallengesPlanning Example Conclusions




Investor´s Perspective

Vodafone14%

Hutchison12%

NTT DoCoMo

11%

Deutsche Telekom

9%

MobilCom9%Telefonica

7%

British Telecom

6%

Others32%

License price per pop. in $US (Oct. 01)

594,2

0

174,2

015

8,90

86,00

60,80

42,60

35,10

30,30

20,50

16,50

15,70

11,20

5,70

4,90

3,50

0,00

0,00

566,7

0

UKGerm

any

Italy

Holland

Austria

South Korea

Singapore

Belgium

Australi

aNorw

aySwitz

erlan

dNew

Zealan

dSpain

SwedenGree

cePortu

galFinlan

dJa

pan

Oct 2001




Public Protest against Mobile Masts

STOPMOBILEMASTS!

Regulatory and Political Issues• RF exposure limitations, Salzburg: 1/10.000 of WHO limit• Abutting owner vetos against new masts• Prohibitions of new sites on public buildings

Public Protest• Legal action against operators• Dramatic increase in site lease• Difficult to acquire new sites

Effects• Roll-out delay• High costs




Time Perspective

Radio Network roll-outNew site acquisitionLicense conditions – service coverageInvestment in infrastructureMany additional sites for the future mobile-data market

Rapid adaptation to the customer needsAdapt to future market growthAdapt to new services and applications

Smart Antennas and enhanced radio networkplanning/optimization reduce time-to-market

Smart Antennas and enhanced radio networkplanning/optimization reduce time-to-market




Outline

MotivationSmart Antenna Overview

– How do they work?– Effects on the power budget– How do Smart Antennas enhance UMTS?

Smart Antenna Planning ChallengesPlanning Example Conclusions




How do Smart Antennas work?

Conventional Smart Antenna

Power radiated in the entirecell

High interference

High exposure

Power radiated in the entirecell

High interference

High exposure

Power radiated in the desireddirections

Interference reduction

Low exposure

Power radiated in the desireddirections

Interference reduction

Low exposure




Effects of Smart Antennas on the power budget

Eb/No

TXpower

PropagationLoss

RXpower

TotalInterference

Considerable interference reductionConsiderable interference reduction

Reduction of the overall signal power!Reduction of the overall signal power!




How do Smart Antennas enhance UMTS?

DOWNLINK

Co v

era g

e

DL Capacitylimited

UPLINK

DOWNLINK

UL Coveragelimited

ServiceCoverage

improvement

Capacityimprovement

ServiceCoverage

improvement

System Throughput [bit/s/cell]




Outline

MotivationSmart Antenna OverviewSmart Antenna Planning Challenges

– Channel Models– Interference Considerations– Space-Time Receivers

Planning Example Conclusions




Channel Models

Terrain data-base

⇒ pathloss

⇒ mean delay

⇒ delay spread

Angular domain?

Smart Antenna deployment requiresspatio-temporal channel models!

Smart Antenna deployment requiresspatio-temporal channel models!




Smart Antenna Interference Situation - Uplink

SIGNAL

INTRA-cellInterference

INTER-cellInterference

Total received uplink powerTotal received uplink power




Smart Antenna Interference Situation - Downlink

PILOTSIGNAL

INTRA-cellInterference

INTER-cellInterference

Total received downlink powerTotal received downlink power




Smart Antenna Receiver Structures

Switched Beam

Beam-Pointing

Space-Time

GainC

DF

Base station signal processing has to beconsidered for radio network planning!

Base station signal processing has to beconsidered for radio network planning!




Outline

MotivationSmart Antenna OverviewSmart Antenna Planning ChallengesPlanning Example

– UMTS Roll-out scenario– Partial Smart Antenna deployment– Capacity increase

Conclusions




Smart Antenna Radio Network Planning Example

City of Vienna, Austria

City of VIENNA, Austria

• 144 cells / 72 “smart” cells• Urban propagation model• Background noise floor of -105dBm• DOA with 8° rms angular spread• 1 Antenna (65° Sector)• 4 Element ULA• d=λ/2 inter-element spacing• Service mix: speech, 64k, 144k• UL processing: seq.-space-time

- spatial processing: opt. comb.- temp. processing: MRC

• DL processing: beamforming- UL AoA




Planning Example

Where do we have bad/no service/coverage?

How does the outage-probability look like?

Smart Antennas - optimum penetration/locations

Where do we have to invest money?




Capacity Increase

2193

1610

920

UL load[%]

Throughput[kbit/s/cell]

BS power [dBm]

37.4 23.8Sector antenna

19.4

14.2

36.7Smart Antennas

+ Opt. Radio Network Planning

36.0Smart AntennasNo planning

+75%

+36%

Smart Antenna radio network planning/optimizationwill boost the capacity by more than 30%!




Antenna Size and Tower Loading

• TDMA-1900 Adaptive Antenna

• Broadcast beam with sector coverage

• Low profile microstrip patch elements

• Dual polarized (±45°) antenna

• Dimensions: Height: 0.66 mWidth: 0.45 m

1 antenna replacing 3 old antennas1 antenna replacing 3 old antennas




Outline

MotivationSmart Antenna OverviewSmart Antenna Planning ChallengesPlanning Example Results and SolutionsConclusions




Conclusions

• Smart Antennas will resolve capacity/coverage and siteacquisition problems in high data rate 3G systems

• Spatio-temporal channel models, accurate interferencemodels and base band signal processing have to beconsidered for Smart Antenna deployment

• Enhanced Smart Antenna radio network planning/optim. offers an additional capacity gain of more than 30%

• Smart Antennas will be mass market products within thenext few years

• Smart Antenna operation and support software tools areavailable for 3G systems




[email protected]

www.nt.tuwien.ac.at/mobile

www.nt.tuwien.ac.at/mobile/staff/Thomas.Neubauer

Documents

Smart Antennas & Radio Network Planning - · PDF fileSmart Antennas & Radio Network Planning ... acquisition problems in high data rate 3G systems ... • Enhanced Smart Antenna radio