Smart Antennas & Radio Network Planning

Transkript

1 Smart Antennas & Radio Network Planning Challenges and Solutions for 3G Vienna University of Technology Institut für Nachrichtentechnik und Hochfrequenztechnik

2 Outline Motivation Investor s Perspective Public Protests against Mobile Masts Time Perspective Smart Antenna Overview Smart Antenna Planning Challenges Planning Example Conclusions Slide 2

3 Investor s Perspective License price per pop. in $US (Oct. 01) Others 32% Vodafone 14% 566,70 Hutchison 12% British Telecom 6% Telefonica 7% MobilCom 9% Deutsche Telekom 9% NTT DoCoMo 11% 174,20 158,90 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 Italy Holland Austria South Korea Singapore Belgium Australia Norway Switzerland New Zealand Spain Sweden Greece Portugal Finland Japan Slide 3 Oct ,20 UK Germany

4 Public Protest against Mobile Masts Regulatory and Political Issues RF exposure limitations, Salzburg: 1/ 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 STOP MOBILE MASTS! Effects Roll-out delay High costs Slide 4

5 Radio Network roll-out Time Perspective New site acquisition License conditions service coverage Investment in infrastructure Many additional sites for the future mobiledata market Rapid adaptation to the customer needs Adapt to future market growth Adapt to new services and applications Smart Antennas and enhanced radio network planning/optimization reduce time-to-market Slide 5

6 Outline Motivation Smart Antenna Overview How do they work? Effects on the power budget How do Smart Antennas enhance UMTS? Smart Antenna Planning Challenges Planning Example Conclusions Slide 6

7 How do Smart Antennas work? Conventional Smart Antenna Power radiated in in the theentire cell cell High High interference High High exposure Power radiated in in the thedesired directions Interference reduction Low Lowexposure Slide 7

8 Effects of Smart Antennas on the power budget TX power Propagation Loss RX power Total Interference Eb/No Considerable interference reduction Reduction of of the overall signal power! Slide 8

9 How do Smart Antennas enhance UMTS? DOWNLINK Service Coverage improvement Coverage UL Coverage limited UPLINK Capacity improvement DL Capacity limited System Throughput [bit/s/cell] Slide 9

10 Outline Motivation Smart Antenna Overview Smart Antenna Planning Challenges Channel Models Interference Considerations Space-Time Receivers Planning Example Conclusions Slide 10

11 Terrain data-base Channel Models pathloss mean delay delay spread Angular domain? Smart Antenna deployment requires spatio-temporal channel models! Slide 11

12 Smart Antenna Interference Situation - Uplink INTER-cell Interference INTRA-cell Interference SIGNAL Total received uplink power Slide 12

13 Smart Antenna Interference Situation - Downlink INTER-cell Interference INTRA-cell Interference SIGNAL PILOT Total received downlink power Slide 13

14 Smart Antenna Receiver Structures Space-Time CDF Beam-Pointing Switched Beam Gain Base station signal processing has to to be considered for radio network planning! Slide 14

15 Outline Motivation Smart Antenna Overview Smart Antenna Planning Challenges Planning Example UMTS Roll-out scenario Partial Smart Antenna deployment Capacity increase Conclusions Slide 15

16 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 Slide 16

17 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? Slide 17

18 Capacity Increase BS power [dbm] UL load [%] Throughput [kbit/s/cell] Sector antenna % Smart Antennas No planning Smart Antennas + Opt. Radio Network Planning % Smart Antenna radio network planning/optimization will boost the capacity by more than 30%! Slide 18

19 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 m Width: 0.45 m 1 antenna replacing 3 old antennas Slide 19

20 Outline Motivation Smart Antenna Overview Smart Antenna Planning Challenges Planning Example Results and Solutions Conclusions Slide 20

21 Conclusions Smart Antennas will resolve capacity/coverage and site acquisition problems in high data rate 3G systems Spatio-temporal channel models, accurate interference models and base band signal processing have to be considered 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 the next few years Smart Antenna operation and support software tools are available for 3G systems Slide 21

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