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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.

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Presentation on theme: "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."— Presentation transcript:

1 Regional Information Meeting and Workshop related to the RRC-06 for the administrations of the African countries Dakar, Senegal, April 2005 RRC technical basis Pham Nhu Hai Radiocommunication Bureau

2 RRC information meeting and workshop Dakar, Senegal April 2005 Outline Frequency bands Planning considerations Reception modes Planning criteria Spectrum masks Network structure and configurations

3 RRC information meeting and workshop Dakar, Senegal April 2005 Frequency bands MHz –DVB-T and T-DAB –No rigid splitting except on national basis –Mixed TV channel spacing –Non-aligned TV channels MHz –DVB-T at 8 MHZ channel spacing

4 RRC information meeting and workshop Dakar, Senegal April 2005 Band III sharing options Single service usage of the band Partitioning of the band Mixed T-DAB and DVB-T

5 RRC information meeting and workshop Dakar, Senegal April 2005 Planning 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

6 RRC information meeting and workshop Dakar, Senegal April 2005 Frequency planning Important field strengths –Wanted field strength, inside coverage area –Outgoing interference FS, areas outside the coverage area –Incoming or Nuisance field strength

7 RRC information meeting and workshop Dakar, Senegal April 2005 In 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

8 RRC information meeting and workshop Dakar, Senegal April 2005 Which reception mode? DVB-T –Fixed –Portable outdoor and indoor –Mobile T-DAB –Mobile –Portable indoor

9 RRC information meeting and workshop Dakar, Senegal April 2005 Fixed 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

10 RRC information meeting and workshop Dakar, Senegal April 2005 Portable reception Antenna pattern: omnidirectional Antenna gain: -2.2/0 dB for VHF/UHF Feeder loss: 0 dB Height loss at 1.5 m –12/16/18 dB for 200/500/800 MHz Building penetration loss –9/8 dB for VHF/UHF

11 RRC information meeting and workshop Dakar, Senegal April 2005 Portable reception.. Location probability –DVB-T: 70% to 95% –T-DAB: 95% (indoor) Polarization discrimination –Not taken into account

12 RRC information meeting and workshop Dakar, Senegal April 2005 Mobile reception Antenna pattern: omnidirectional Antenna gain: -2.2/0 dB for VHF/UHF Feeder loss: 0dB Height loss at 1.5 m –12/16/18 dB for 200/500/800 MHz Location probability: 99% Polarization discrimination: No

13 RRC information meeting and workshop Dakar, Senegal April 2005 Planning criteria C/N values Protection ratios Location conversion factors and percentage of time

14 RRC information meeting and workshop Dakar, Senegal April 2005 DVB-T system variants? 2k or 8k OFDM System variants –QPSK, 16QAM or 64 QAM –Code rate –Bit rate 120 DVB-T system variants

15 RRC information meeting and workshop Dakar, Senegal April 2005 C/N values for planning (Table 3.4-1)

16 RRC information meeting and workshop Dakar, Senegal April 2005 C/N and Data rate vs code rate (source EBU)

17 RRC information meeting and workshop Dakar, Senegal April 2005 C/N and Data rate vs guard interval (source EBU)

18 RRC information meeting and workshop Dakar, Senegal April 2005 C/N values for T-DAB C/N = 15 dB (ITU-R BS 1660)

19 RRC information meeting and workshop Dakar, Senegal April 2005 Protection ratios DVB-T T-DAB Analogue TV DVB-T T-DAB Analogue TV Wanted Unwanted ITU-R BT dB ITU-R BS ITU-R T. 655 ITU-R BT. 1368

20 RRC information meeting and workshop Dakar, Senegal April 2005 Missing protections ratios PXT proposed working assumptions based on –Preliminary results from Working parties 6E, 8A, 8B and 9A Submitted to IPG-STG for advice and consideration IPG1 (4-8 July 2005) confirms or directs PXT to use other values

21 RRC information meeting and workshop Dakar, Senegal April 2005 Location correction factors and percentage of time Sharp 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

22 RRC information meeting and workshop Dakar, Senegal April 2005 Signal variations – outdoor Coverage target (location probability in %) Location correction factor (VHF and UHF in dB)

23 RRC information meeting and workshop Dakar, Senegal April 2005 Signal variations – indoor Coverage target (%) Location correction factor - VHF (dB) Location correction factor - UHF (dB)

24 RRC information meeting and workshop Dakar, Senegal April 2005 Calculate 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

25 RRC information meeting and workshop Dakar, Senegal April 2005 Minimum median FS (dBuV/m)

26 RRC information meeting and workshop Dakar, Senegal April 2005 Minimum median FS (dBuV/m)

27 RRC information meeting and workshop Dakar, Senegal April 2005 Minimum median field strength – DVB-T How to calculate? How to calculate

28 RRC information meeting and workshop Dakar, Senegal April 2005 Spectrum mask T-DAB –ITU-R BS –3 different masks DVB-T –Symmetrical N for non-critical S for sensitive –Unsymmetrical Adjacent channel to analogue TV

29 RRC information meeting and workshop Dakar, Senegal April 2005 Network structure and configurations General considerations Reference planning configurations (RPC) Reference networks Network structure and configurations

30 RRC information meeting and workshop Dakar, Senegal April 2005 Typical configurations MFN SFN –Open –Closed Mixed MFN - SFN

31 RRC information meeting and workshop Dakar, Senegal April 2005 Reference 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

32 RRC information meeting and workshop Dakar, Senegal April 2005 Emed for DVB-T Reference Planning configurations RPCRPC1RPC2RPC3 Location probability 95% Reference C/N Reference Emed (200 MHz) Reference Emed (650 MHz) 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

33 RRC information meeting and workshop Dakar, Senegal April 2005 Emed for T-DAB Reference planning configurations RPCRPC4RPC5 Location probability 99%95% Reference C/N 15 Reference Emed dBuV/m (200 MHz) 6066 RPC4: RPC for mobile reception RPC5: RPC for portable indoor reception

34 RRC information meeting and workshop Dakar, Senegal April 2005 Reference networks (RN) Theoretical network structure –Approximation of real network implementation (SFN) –Used for compatibility analysis

35 RRC information meeting and workshop Dakar, Senegal April 2005 Define a RN Number of transmitters Distance between transmitters Transmitter network geometry Transmitter power Transmitter antenna height Transmitter antenna pattern Service area

36 RRC information meeting and workshop Dakar, Senegal April 2005 RNs for DVB-T RN1: large service area SFN RN2: small service area or dense SFN RN3: small service area SFN for urban environment RN4: semi-closed small small service area SFN

37 RRC information meeting and workshop Dakar, Senegal April 2005 RNs for T-DAB RN5 –mobile reception –RPC 4 RN6 –Portable indoor –RPC5 Same RN configuration with transmitter power 9 dB more for RN6.

38 RRC information meeting and workshop Dakar, Senegal April 2005 Thanks for your attention!

39 RRC information meeting and workshop Dakar, Senegal April 2005 Thanks for your attention! 10


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