Access network (WP3): coverage aspects

Hugo Gauderis Etienne Deventer VRT

Wout Joseph David Plets Leen Verloock Luc Martens Ghent University/IBBT

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 Context and objectives  Characteristics of DVB-H system in Ghent  Coverage aspects

 Coverage 1 transmitter  Wireless penetration for 100 buildings  Technical performance

 Calculation of required number of transmitters  Conclusions

Overview

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Context and objectives

 MADUF WP3: Access network  DVB-H: Digital Video Broadcasting-

Handheld  EN 300 744 and EN 302 304

 High data rate broadcast access for hand-held devices

 Objectives  Coverage  Technical performance  Number of base stations for good

indoor reception in Flanders

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Characteristics of DVB-H system

 Single frequency network (SFN)  602 MHz

 Channel bandwidth  8 MHz

 3 base station (BS) antennas  Keizer Karel (BS1),

Ledeganck (BS3), Groendreef (BS2)

 hBS = 64 m, 63 m, 57 m  ERP = 6 kW, 7.5 kW, 2.8 kW

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 Context and objectives  Characteristics of DVB-H system in Ghent  Coverage aspects

 Coverage 1 transmitter  Wireless penetration for 100 buildings  Technical performance

 Calculation of required number of transmitters for Flanders  Conclusions

Overview

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Coverage: 1 transmitter

  Receiver Rx on Car  Rx: vertical polarisation  Speed: 25 km/h [ITU

1708]

BS

  BS: Keizer Karelstraat  ERP = 5970 W  Height: 64 m

2.85 m

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Coverage: Ghent

  Equivalent electric field [dBµV/m]  hRx = 2.85 m

  Range portable indoor (class B): 16-QAM 1/2, no MPE-FEC

 3.2 km  Path loss model developed for

Gent

< 64.5 dBµV/m

transmitter

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 Context and objectives  Characteristics of DVB-H system in Ghent  Coverage aspects

 Coverage 1 transmitter  Wireless penetration for 100 buildings  Technical performance

 Calculation of required number of transmitters for Flanders  Conclusions

Overview

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Categories of houses

 Penetration loss of 100 buildings in Ghent

 Categories  Office building

 Non coated (7)  Coated (2)

 Apartment (7)  Station (1)  Villa / bungalow (17)  Mansion (15)  Terraced houses (51)

 Private (44)  Shop (5)  Bank (2)

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Investigation of PenL  Penetration loss PenL [dB] =

field outdoor / field indoor   PenL decreases for more radiated sides   PenLvilla < PenLmansion < PenLprivate house

 Average value for PenL 8.10 dB  PenLcoated office building (21.94 dB) >>

PenLnon-coated office building (5.30 dB)

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 Context and objectives  Characteristics of DVB-H system in Ghent  Coverage aspects

 Coverage 1 transmitter  Wireless penetration for 100 buildings  Technical performance

 Calculation of required number of transmitters for Flanders  Conclusions

Overview

Investigated scenarios   Reception conditions: 9 scenarios

  Portable reception  Outdoor walking (20 routes)   Indoor standing (13 buildings)   Indoor walking (13 buildings)

  Mobile reception  Car 20 km/h (70.5 km)  Car 70 km/h (37.5 km)  Car 120 km/h (50 km)   Train   Tram  Bus

  Several thousands of measurement points for each scenario

Investigated schemes

 14 different settings  QPSK, 16-QAM,

64-QAM  MPE-FEC 67/68, 7/8,

5/6, 3/4, 2/3, 1/2  Inner code rate

 1/2 and 2/3

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Example: car 20 km/h

 Reception quality in Ghent in car driving at 20 km/h

 Tables received  Correct: green  Corrected: orange   Incorrect: red

16-QAM 1/2 MPE-FEC 7/8, 4K, GI = 1/8

 Higher C/(N+I) required for more difficult reception conditions

 Higher speed  Reception in trains  …

16-QAM 1/2 MPE-FEC 7/8, 4K, GI = 1/8

Comparison of different scenarios

most difficult reception conditions

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 Context and objectives  Characteristics of DVB-H system in Ghent  Coverage aspects

 Coverage 1 transmitter  Wireless penetration for 100 buildings  Technical performance

 Calculation of required number of transmitters for Flanders  Conclusions

Overview

Categories

 Categories of base stations  Category 1: height = 35 m / ERP = 2 kW  Category 2: height = 60 m / ERP = 5 kW  Category 3: height = 150 m / ERP = 20 kW

category 1 35 m, 2 kW

category 2 60 m, 5 kW

category 3 150 m, 20 kW

Scenarios

 Five scenarios  Coverage for Flanders,

regional cities, and Brussels  Scenario 1: 100 % category 1

 2 kW, hBS = 35 m  Scenario 2: 100 % category 2

 5 kW, hBS = 60 m  Scenario 3: 100 % category 3

 20 kW, 150 m  Scenario 4: available antenna

sites of VRT  Scenario 5: building additional

medium infrastructure

35 m 2 kW

60 m 5 kW

150 m 20 kW

#BS for scenarios   Indoor portable reception (class B)

 10 Mbps, reference receiver ETSI  16-QAM 1/2, MPE-FEC 7/8

 #BS  Largest for scenario 1  Lowest for scenario 3  Higher for hexagons

than for circles  Realistic scenarios 4 and 5

 High number of required BS  #BS for scenario 5 lower

 Additional medium infrastructure

 Very sensitive to C/N

#BS

scenario circle hexagon

1 816 986

2 274 332

3 47 65

4 653 823

5 563 733

Conclusions

 Coverage in Ghent  Coverage models have been developed  Wireless building penetration

 Technical performance  Different reception scenarios  Different settings

 Calculation of required number of BS for good indoor DVB-H coverage in Flanders for about 10 Mbps  Different categories of BS: low, medium, high  Very sensitive to C/N