Title: Regional Information Meeting and Workshop relatedto the RRC06 for the administrations of the African
1Regional Information Meeting and Workshop
related to the RRC-06 for the administrations of
the African countriesDakar, Senegal, 25-29 April
2005
Pham Nhu Hai Radiocommunication Bureau
2Outline
- Frequency bands
- Planning considerations
- Reception modes
- Planning criteria
- Spectrum masks
- Network structure and configurations
3Frequency 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
4Band III sharing options
- Single service usage of the band
- Partitioning of the band
- Mixed T-DAB and DVB-T
5Planning 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
6Frequency planning
- Important field strengths
- Wanted field strength, inside coverage area
- Outgoing interference FS, areas outside the
coverage area - Incoming or Nuisance field strength
7In 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
8Which reception mode?
- DVB-T
- Fixed
- Portable outdoor and indoor
- Mobile
- T-DAB
- Mobile
- Portable indoor
9Fixed 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
10Portable 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
11Portable reception ..
- Location probability
- DVB-T 70 to 95
- T-DAB 95 (indoor)
- Polarization discrimination
- Not taken into account
12Mobile 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
13Planning criteria
- C/N values
- Protection ratios
- Location conversion factors and percentage of time
14DVB-T system variants?
- 2k or 8k OFDM
- System variants
- QPSK, 16QAM or 64 QAM
- Code rate
- Bit rate
- 120 DVB-T system variants
15C/N values for planning (Table 3.4-1)
16C/N and Data rate vs code rate (source EBU)
17C/N and Data rate vs guard interval (source EBU)
18C/N values for T-DAB
- C/N 15 dB (ITU-R BS 1660)
19Protection ratios
Unwanted
Wanted
ITU-R BT. 1368
DVB-T
DVB-T
ITU-R BS. 1660
T-DAB
T-DAB
15 dB
ITU-R BS. 1660
Analogue TV
Analogue TV
ITU-R BT. 1368
ITU-R T. 655
20Missing 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
21Location 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
22Signal variations outdoor
23Signal variations indoor
24Calculate 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
25Minimum median FS (dBuV/m)
26Minimum median FS (dBuV/m)
27Minimum median field strength DVB-T
28Spectrum 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
29Network structure and configurations
Network structure and configurations
- General considerations
- Reference planning configurations (RPC)
- Reference networks
30Typical configurations
- MFN
- SFN
- Open
- Closed
- Mixed MFN - SFN
31Reference 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
32Emed for DVB-T Reference Planning configurations
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
33Emed for T-DAB Reference planning configurations
RPC4 RPC for mobile reception
RPC5 RPC for portable indoor reception
34Reference networks (RN)
- Theoretical network structure
- Approximation of real network implementation
(SFN) - Used for compatibility analysis
35Define a RN
- Number of transmitters
- Distance between transmitters
- Transmitter network geometry
- Transmitter power
- Transmitter antenna height
- Transmitter antenna pattern
- Service area
36RNs 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
37RNs for T-DAB
- RN5
- mobile reception
- RPC 4
- RN6
- Portable indoor
- RPC5
- Same RN configuration with transmitter power 9 dB
more for RN6.
38Thanks for your attention!
39Thanks for your attention!
10
10
10
10