Preparation for the Regional Radiocommunication

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Preparation for the Regional Radiocommunication
Conference 2004
David D. Botha
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Preparation for RRC-04
How did it all begin?
Resolution 1185 (29 June 2001)
Review of ST61 for the Implementation of
Terrestrial Digital Broadcasting
Limited to the Frequency Bands 174 230 MHz and
470 862 MHz
Resolution 1180 (21 December 2001)
Include the review of GE89 for the Implementation
of Digital Broadcasting
Include certain countries that do not form part
of the Planning Area of ST61 or GE89
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Preparation for RRC-04
Schedule for developing a new Agreement
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Preparation for RRC-04
Schedule for developing a new Agreement continued
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Preparation for RRC-04
Preparatory Work for RRC- 04
Definition of the Planning Area
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Preparation for RRC-04
Preparatory Work for RRC- 04
Definition of the Planning Area continued
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Preparation for RRC-04
Preparatory Work for RRC- 04
Definition of the Planning Area continued
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Preparation for RRC-04
Preparatory Work for RRC- 04
Definition of the Planning Area continued
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Preparation for RRC-04
Preparatory Work for RRC- 04
Preparation of the Report for RRC-04
Task for TG - 6/8
Report with Draft Chapter Contents

• Introduction
• Definitions
• Technical studies
• Propagation information
• Technical bases
• Transition procedures
• Frequency sharing between digital sound and
  television broadcasting
• Compatibility with other primary services
• Procedure for establishing input requirements
• Planning tools
• Elements for planning exercises
• Draft text to be considered by the RRC for
  inclusion in the Agreement

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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting
Types of Services
Digital Sound Broadcasting (T-DAB )
Digital Television Broadcasting (DVB-T)
Assignments versus Allotments
Methods have different approaches
Ultimately the same result
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Assignment Planning
RR 1.18 - authorisation given by an
administration for a radio station to use a
radio frequency or a radio frequency channel
under specified conditions.
Used where
Detail network information is available
Spectrum sharing is required with existing
networks
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Allotment Planning
RR 1.17 entry of a designated frequency channel
in an agreed plan, adopted by a competent
conference, for use by one or more
administrations for a terrestrial or
space radiocommunication service in one or more
identified countries or geographical areas and
under specified conditions.
Used where
Usually Single Frequency Networks,
Multi-Frequency Networks are also possible
No detail information of future networks
available when developing frequency plan
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Compatibility with Analogue Plans
Ensure protection of existing and future analogue
services
Limit spectrum available to develop a digital
frequency plan
Severely limit the introduction of digital
broadcasting in national networks and
neighbouring countries
Type of reception
Determines coverage, radiation power levels,
spectrum availability etc.
Fixed Antenna Reception
Directional antenna
Antenna t installed at rooftop
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Type of reception
Portable Reception
Class A Portable Reception
Outdoor reception
Receiver has built-in or attached non-directional
antenna
Antenna is located not lower than 1.5 metres
above ground level
Class B Portable Reception
Indoor reception
Receiver has built-in or attached non-directional
antenna
Antenna is located not lower than 1.5 metres
above floor level
In a room on the ground floor with an external
window
Mobile Reception
Non-directional antenna mounted on roof of moving
vehicle
Other conditions similar to Class A portable
reception
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Constraints
Frequency plan limited to a specified frequency
band
Reserve spectrum for different digital
broadcasting service
Existing digital assignments in the Plans of ST61
and GE89 may need to be incorporated
Specifying a frequency plan that should also
consider other primary services
Protection of other Primary Services
Definition of sharing criteria and mutual
protection ratios
Services include
Fixed Service
Radionavigation Service
Mobile Service
Radio Astronomy Service
Aeronautical Radionavigation Service
Broadcasting Satellite Service
Land Mobile Service
Mobile Satellite Service
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
Propagation Modelling
Coverage prediction
Interference level prediction
ITU-R Recommendation P.1546
Designated replacement recommendation for ITU-R
Rec. P.370
Many aspects of ITU-R Rec. P.370 incorporated
into this recommendation
Improved accuracy compared to Rec. P.370 for
certain tested cases
Questionable results for mixed path and certain
sea-path predictions
ITU-R Recommendation P.370
Has been withdrawn
Also a version as modified by GE84
Known limitations and errors
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Preparation for RRC-04
Developing a Frequency Plan for Digital
Broadcasting continued
System Considerations
Protection Ratios and C/N Ratios
Statistical Reception Environment Models
Rayleigh Channel (P1)
Several statistically independent incoming
signals, thermal noise
No single signal dominates
Predominant in mobile and portable reception
Rice Channel (F1)
One dominant signal and several lower level
signals, thermal noise
Predominant in fixed antenna reception
C/N Ratio for SFN Planning
Use of Effective Protection Target as performance
measure
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Developing a Frequency Plan for Digital
Broadcasting continued
SFN versus MFN
Both network planning methods can be used to
achieve the same result
SFN
Whole network uses one frequency
The frequency has to be protected around the
whole network
Transmitters work dependently
Self-interference affects large networks
Average transmit power level might be lower than
in an MFN
Planning and implementation is more difficult
than for an MFN
MFN
Network uses several frequencies
Each frequency has to be protected around the
individual transmitter
Transmitters work independently
A frequency may be re-used in the same network
(interference potential)
Planning and implementation is simpler than for
an SFN
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Preparation for RRC-04
Outstanding Items for the Preparation of the
Conference
Updating of the BR database with existing
analogue transmission networks. This information
will be the reference. (Administrations are
still to react!)
The role of the existing analogue television
services in the development of a new frequency
plan(s) for digital broadcasting.
The completion of the report to the Conference.
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Preparation for RRC-04
Thank you for your attention
Hope to see you at RRC-04!