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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Band III sharing optionsBand III sharing options
Single service usage of the bandPartitioning of the bandMixed T-DAB and DVB-T
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Which reception mode?Which reception mode?
DVB-T– Fixed– Portable outdoor and indoor–Mobile
T-DAB–Mobile – Portable indoor
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Portable reception ..Portable reception ..
Location probability– DVB-T: 70% to 95%– T-DAB: 95% (indoor)
Polarization discrimination– Not taken into account
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Planning criteriaPlanning criteria
C/N valuesProtection ratiosLocation conversion factors and
percentage of time
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
C/N values for planning C/N values for planning (Table 3.4-1)(Table 3.4-1)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
C/N and Data rate vs code rate C/N and Data rate vs code rate (source EBU)(source EBU)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
C/N and Data rate vs guard intervalC/N and Data rate vs guard interval (source EBU)(source EBU)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
C/N values for T-DABC/N values for T-DAB
C/N = 15 dB (ITU-R BS 1660)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Signal variations – outdoorSignal variations – outdoor
Coverage target (location probability
in %)
Location correction factor (VHF and UHF
in dB)
99 13
95 9
70 3
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Signal variations – indoorSignal variations – indoor
Coverage target
(%)
Location correction
factor - VHF (dB)
Location correction
factor - UHF (dB)
95 10 13
70 3 4
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Minimum median FS (dBuV/m)Minimum median FS (dBuV/m)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Minimum median FS (dBuV/m)Minimum median FS (dBuV/m)
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Minimum median field strength – DVB-TMinimum median field strength – DVB-T
How to calculate?
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Network structure and Network structure and configurationsconfigurationsGeneral considerationsReference planning configurations
(RPC)Reference networks
Network structure and Network structure and configurationsconfigurations
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Typical configurationsTypical configurations
MFNSFN– Open – Closed
Mixed MFN - SFN
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Reference networks (RN)Reference networks (RN)
Theoretical network structure– Approximation of real network
implementation (SFN)– Used for compatibility analysis
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Define a RNDefine a RN
Number of transmittersDistance between transmittersTransmitter network geometryTransmitter powerTransmitter antenna heightTransmitter antenna patternService area
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
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.
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Thanks for your attention!Thanks for your attention!
RRC information meeting and workshop
Dakar, Senegal 25-29 April 2005
Thanks for your attention!Thanks for your attention!
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