ITU 频率规划技术基础
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RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Frequency bands
174-230 MHz
– DVB-T and T-DAB – No rigid splitting except on national
Coverage target (%)
95
Location correction factor - VHF
(dB)
10
Location correction factor - UHF
(dB)
13
70
3
4
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Band III sharing options
Single service usage of the band Partitioning of the band Mixed T-DAB and DVB-T
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N and Data rate vs code rate
(source EBU)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N and Data rate vs guard interval
(source EBU)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Missing protections ratios
PXT proposed working assumptions based on
– Preliminary results from Working parties 6E, 8A, 8B and 9A
RRC information meeting and workshop Dakar, Senegal 25-29 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
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
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 basis
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N values for T-DAB
C/N = 15 dB (ITU-R BS 1660)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
– Network configuration
• Evolution from MFN to SFN
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Which reception mode?
DVB-T
– Fixed – Portable outdoor and indoor – Mobile
Protection ratios
Wanted DVB-T
ITU-R BT. 1368
Unwanted DVB-T
T-DAB Analogue TV
ITU-R BS. 1660 ITU-R BS. 1660
15 dB
T-DAB
ITU-R BT. 1368 ITU-R T. 655
Analogue TV
– No single and universal solution
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Frequency planning
Important field strengths
– Wanted field strength, inside coverage area
Calculate minimum median field strength
Minimum C/N Receiver noise input power (receiver noise figure
– Correction to ITU-R 1546 curves therefore required
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Signal variations – outdoor
Coverage target (location probability
120 DVB-T system variants
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N values for planning (Table 3.4-1)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Submitted to IPG-STG for advice and consideration
IPG1 (4-8 July 20Байду номын сангаас5) confirms or directs PXT to use other values
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
– Outgoing interference FS, areas outside the coverage area
– Incoming or Nuisance field strength
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
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
– 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 ..
Pham Nhu Hai Radiocommunication Bureau
Outline
Frequency bands Planning considerations Reception modes Planning criteria Spectrum masks Network structure and configurations
– 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
T-DAB
– Mobile – Portable indoor
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Fixed reception
Radiation pattern of receiving antenna
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
Location probability: 99% Polarization discrimination: No
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Planning criteria
C/N values Protection ratios Location conversion factors and
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
Planning considerations
Producing a digital plan
– Complex, multi-dimensional project – Many technical inputs
• Minimum signal levels • Protection ratios • Type of reception, etc….
in %)
99
Location correction factor (VHF and UHF
in dB)
13
95
9
70
3
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Signal variations – indoor
percentage of time
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
DVB-T system variants?
2k or 8k OFDM System variants
– QPSK, 16QAM or 64 QAM – Code rate – Bit rate
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
Frequency bands
174-230 MHz
– DVB-T and T-DAB – No rigid splitting except on national
Coverage target (%)
95
Location correction factor - VHF
(dB)
10
Location correction factor - UHF
(dB)
13
70
3
4
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Band III sharing options
Single service usage of the band Partitioning of the band Mixed T-DAB and DVB-T
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N and Data rate vs code rate
(source EBU)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N and Data rate vs guard interval
(source EBU)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Missing protections ratios
PXT proposed working assumptions based on
– Preliminary results from Working parties 6E, 8A, 8B and 9A
RRC information meeting and workshop Dakar, Senegal 25-29 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
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
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 basis
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N values for T-DAB
C/N = 15 dB (ITU-R BS 1660)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
– Network configuration
• Evolution from MFN to SFN
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Which reception mode?
DVB-T
– Fixed – Portable outdoor and indoor – Mobile
Protection ratios
Wanted DVB-T
ITU-R BT. 1368
Unwanted DVB-T
T-DAB Analogue TV
ITU-R BS. 1660 ITU-R BS. 1660
15 dB
T-DAB
ITU-R BT. 1368 ITU-R T. 655
Analogue TV
– No single and universal solution
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Frequency planning
Important field strengths
– Wanted field strength, inside coverage area
Calculate minimum median field strength
Minimum C/N Receiver noise input power (receiver noise figure
– Correction to ITU-R 1546 curves therefore required
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Signal variations – outdoor
Coverage target (location probability
120 DVB-T system variants
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
C/N values for planning (Table 3.4-1)
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Submitted to IPG-STG for advice and consideration
IPG1 (4-8 July 20Байду номын сангаас5) confirms or directs PXT to use other values
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
– Outgoing interference FS, areas outside the coverage area
– Incoming or Nuisance field strength
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
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
– 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 ..
Pham Nhu Hai Radiocommunication Bureau
Outline
Frequency bands Planning considerations Reception modes Planning criteria Spectrum masks Network structure and configurations
– 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
T-DAB
– Mobile – Portable indoor
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Fixed reception
Radiation pattern of receiving antenna
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
Location probability: 99% Polarization discrimination: No
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Planning criteria
C/N values Protection ratios Location conversion factors and
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
Planning considerations
Producing a digital plan
– Complex, multi-dimensional project – Many technical inputs
• Minimum signal levels • Protection ratios • Type of reception, etc….
in %)
99
Location correction factor (VHF and UHF
in dB)
13
95
9
70
3
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
Signal variations – indoor
percentage of time
RRC information meeting and workshop Dakar, Senegal 25-29 April 2005
DVB-T system variants?
2k or 8k OFDM System variants
– QPSK, 16QAM or 64 QAM – Code rate – Bit rate
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