Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countries Dakar, Senegal, 25-29 April 2005 RRC technical.

Regional Information Meeting and Workshop related to the Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countriesRRC-06 for the administrations of the African countries

Dakar, Senegal, 25-29 April 2005Dakar, Senegal, 25-29 April 2005

RRC technical basis

Pham Nhu HaiRadiocommunication Bureau

RRC information meeting and workshop

Dakar, Senegal 25-29 April 2005

OutlineOutline

Frequency bandsPlanning considerationsReception modesPlanning criteriaSpectrum masksNetwork structure and

configurations



Frequency bandsFrequency bands

174-230 MHz– DVB-T and T-DAB– No rigid splitting except on national

basis–Mixed TV channel spacing– Non-aligned TV channels

470-862 MHz– DVB-T at 8 MHZ channel spacing



Band III sharing optionsBand III sharing options

Single service usage of the bandPartitioning of the bandMixed T-DAB and DVB-T



Planning considerationsPlanning considerations

Producing a digital plan– Complex, multi-dimensional project–Many technical inputs• Minimum signal levels• Protection ratios• Type of reception, etc….

– No single and universal solution



Frequency planningFrequency planning

Important field strengths –Wanted field strength, inside coverage

area– Outgoing interference FS, areas outside

the coverage area– Incoming or Nuisance field strength



In developing the digital planIn developing the digital plan

Use representative criteria and parameters

Ensure flexibility for future demands– Conversion between reception modes• Fixed to portable and mobile reception

– Network configuration• Evolution from MFN to SFN



Which reception mode?Which reception mode?

DVB-T– Fixed– Portable outdoor and indoor–Mobile

T-DAB–Mobile – Portable indoor



Fixed receptionFixed reception

Radiation pattern of receiving antenna– ITU-R BT.419

Receiving antenna gain– 7/10/12 dB for 200/500/800 MHz

Feeder loss– 2/3/5 dB for 200/500/800 MHz

Location probability – 95% Polarization discrimination - Yes



Portable receptionPortable reception

Antenna pattern: omnidirectionalAntenna gain: -2.2/0 dB for VHF/UHFFeeder loss: 0 dBHeight loss at 1.5 m– 12/16/18 dB for 200/500/800 MHz

Building penetration loss– 9/8 dB for VHF/UHF



Portable reception ..Portable reception ..

Location probability– DVB-T: 70% to 95%– T-DAB: 95% (indoor)

Polarization discrimination– Not taken into account



Mobile receptionMobile reception

Antenna pattern: omnidirectionalAntenna gain: -2.2/0 dB for VHF/UHFFeeder loss: 0dBHeight loss at 1.5 m– 12/16/18 dB for 200/500/800 MHz

Location probability: 99%Polarization discrimination: No



Planning criteriaPlanning criteria

C/N valuesProtection ratiosLocation conversion factors and

percentage of time



DVB-T system variants?DVB-T system variants?

2k or 8k OFDMSystem variants– QPSK, 16QAM or 64 QAM– Code rate– Bit rate

120 DVB-T system variants



C/N values for planning C/N values for planning (Table 3.4-1)(Table 3.4-1)



C/N and Data rate vs code rate C/N and Data rate vs code rate (source EBU)(source EBU)



C/N and Data rate vs guard intervalC/N and Data rate vs guard interval (source EBU)(source EBU)



C/N values for T-DABC/N values for T-DAB

C/N = 15 dB (ITU-R BS 1660)



Protection ratiosProtection ratios

DVB-T

T-DAB

Analogue TV

DVB-T

T-DAB

Analogue TV

Wanted UnwantedITU-R BT. 1368

15 dBITU-R BS. 1660

ITU-R BS. 1660

ITU-R T. 655

ITU-R BT. 1368



Missing protections ratiosMissing protections ratios

PXT proposed working assumptions based on– Preliminary results from Working

parties 6E, 8A, 8B and 9ASubmitted to IPG-STG for advice and

considerationIPG1 (4-8 July 2005) confirms or

directs PXT to use other values



Location correction factors and Location correction factors and percentage of timepercentage of timeSharp degradation of quality – High percentage of time and location for

wanted signal– Low percentage of time for interfereing

signals– Correction to ITU-R 1546 curves

therefore required



Signal variations – outdoorSignal variations – outdoor

Coverage target (location probability

in %)

Location correction factor (VHF and UHF

in dB)

99 13

95 9

70 3



Signal variations – indoorSignal variations – indoor

Coverage target

(%)

Location correction

factor - VHF (dB)

Location correction

factor - UHF (dB)

95 10 13

70 3 4



Calculate minimum median field strengthCalculate minimum median field strength

Minimum C/N Receiver noise input power (receiver noise figure

and noise bandwidth) Effective antenna aperture (antenna gain) Feeder loss Minimum field strength Man-made noise Height loss Building penetration loss Location correction factor

Minimum median field strength



Minimum median FS (dBuV/m)Minimum median FS (dBuV/m)



Minimum median FS (dBuV/m)Minimum median FS (dBuV/m)



Minimum median field strength – DVB-TMinimum median field strength – DVB-T

How to calculate?



Spectrum maskSpectrum mask

T-DAB– ITU-R BS 1114-5– 3 different masks

DVB-T– Symmetrical

• N for non-critical• S for sensitive

– Unsymmetrical• Adjacent channel to analogue TV



Network structure and Network structure and configurationsconfigurationsGeneral considerationsReference planning configurations

(RPC)Reference networks

Network structure and Network structure and configurationsconfigurations



Typical configurationsTypical configurations

MFNSFN– Open – Closed

Mixed MFN - SFN



Reference planning configurationsReference planning configurations

Three RPC (1,2 & 3) for DVB-T– Fixed– Portable outdoor and mobile– Portable indoor

Two RPC (4 & 5) for T-DAB–Mobile– Portable indoor



Emed for DVB-T Reference Planning configurationsEmed for DVB-T Reference Planning configurations

RPC RPC1 RPC2 RPC3

Location probability

95% 95% 95%

Reference C/N 21 19 17

Reference Emed (200 MHz)

50 67 76

Reference Emed (650 MHz)

56 78 88

RPC1: RPC for fixed roof reception

RPC2: RPC for portable outdoor or low coverage quality portable indoor or mobile reception

RPC3: RPC for higher coverage quality for portable indoor reception



Emed for T-DAB Reference planning configurationsEmed for T-DAB Reference planning configurations

RPC RPC4 RPC5

Location probability

99% 95%

Reference C/N 15 15

Reference Emed dBuV/m (200 MHz)

60 66

RPC4: RPC for mobile reception

RPC5: RPC for portable indoor reception



Reference networks (RN)Reference networks (RN)

Theoretical network structure– Approximation of real network

implementation (SFN)– Used for compatibility analysis



Define a RNDefine a RN

Number of transmittersDistance between transmittersTransmitter network geometryTransmitter powerTransmitter antenna heightTransmitter antenna patternService area



RNs for DVB-TRNs for DVB-T

RN1: large service area SFNRN2: small service area or dense

SFNRN3: small service area SFN for

urban environmentRN4: semi-closed small small service

area SFN



RNs for T-DABRNs for T-DAB

RN5–mobile reception– RPC 4

RN6– Portable indoor– RPC5

Same RN configuration with transmitter power 9 dB more for RN6.



Thanks for your attention!Thanks for your attention!



Thanks for your attention!Thanks for your attention!

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Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countries Dakar, Senegal, 25-29 April 2005 RRC technical.

Documents

rrc information meeting

workshop dakar

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dvbt slide

vhfuhf slide

configurations slide

sfn slide

account slide