BR/TSD Accra 2005 BCD Workshop for the African Countries Working assumptions for the production of...

BR/TSD

Accra 2005

BCD

Workshop for the African Countries

Working assumptions for the production of the draft plan

10 – 14 October 2005Accra

David Botha

BR/TSD

Accra 2005

BCD


Justification for working assumptions

•Certain technical parameters are unavailable for assignments:

- Some were not required or mandatory in ST61- Some are not mandatory for the MIFR

•Certain planning criteria are unavailable in the plans and/or ITU-R recommendations:

- Some protection ratios for mutual interaction between broadcasting services- Some protection ratios for the interaction between broadcasting and other primary services

•Certain instructions in the RRC-04 Report are not clear:- Treatment of existing and planned assignments of other services when the administration gives no indication

BR/TSD

Accra 2005

BCD


Sources of working assumptions

•Proposals from the Planning exercise team•Working parties:

•WP 3K•WP 6E•WP 7D•WP 8A•WP 8B•WP 9D

•Regional groups•IPG-STG

BR/TSD

Accra 2005

BCD


Validity of working assumptions

•Proposals from the Planning exercise team, WP’s and Regional groups were used for the first planning exercise only based on IPG-STG endorsement

•Assumptions to be applied for the draft plan only on IPG endorsement

•Working assumptions for draft plan in IPG-1/51 Annex 1 – 10, Annex 19 and their appendices

•WPIPG also endorsed some working assumptions, as they were not considered during the IPG-1 meeting

BR/TSD

Accra 2005

BCD


Working assumptions for African Countries

•Correction in propagation model for mixed paths (general)•MRC may submit requirements in channel 5•Analogue TV assignments in the MIFR will be ignored if they have equivalent assignments in the a plan•MIFR assignments that have been suppressed since 1989/12/31 should be excluded•Use recommended and updated protection criteria from WP’s for those that are not available in recommendations or in the RRC-04 Report

Broadcasting services

BR/TSD

Accra 2005

BCD




DVB-T

T-DAB

Analogue TV

DVB-T

T-DAB

Analogue TV

ITU-R BT. 1368

15 dBITU-R BS. 1660

ITU-R BS. 1660

ITU-R T. 655

ITU-R BT. 1368

BR/TSD

Accra 2005

BCD



•95% of locations should be used for digital broadcasting•Image channel interference is not taken into account•Compatibility of channels that are not directly adjacent is not taken into account•Specific information on channelisation arrangements (specifically Band III) – inform BR formally of changes•Indications of colour systems to be used where they are absent in MIFR, ST61•ERP values for Reference Networks should be scaled by frequency


BR/TSD

Accra 2005

BCD



•Low power assignments and small allotments can only be treated if they conform to § 1.6.16 and § 1.6.17.3•All existing analogue TV assignments are protected during the transition period•A reasonable number of requirements should be provided for non-participating administrations for the draft plan•Minimum median field strength for analogue television:

•53 dBμV/m in Band III• in Bands IV/V

• above + 2 dB for system K


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BR/TSD

Accra 2005

BCD



•Spectrum mask is mandatory for DVB-T assignments•Assume non-critical mask for DVB-T allotments•If effective heights are missing use the maximum effective height in all 36 directions•If the analogue television assignment has no antenna height use:

•37.5 m agl if ERP > 10 W (either pol. plane) in Band III•37.5 m agl if ERP > 100 W (either pol. plane) in Bands IV/V•else use 10 m agl


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BR/TSD

Accra 2005

BCD



•In the case of a set of linked assignments, their individual service areas are calculated and protected. No overall contour is calculated for the set•It is not possible to specify beam tilt – the normalised radiation pattern is specified in the horizontal plane and the maximum value is independent of beam tilt and azimuth


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BR/TSD

Accra 2005

BCD




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Different cases of linked requirements and how they are treated in by the planning software

Case Description Treatment by planning software

1 2 or more digital assignments forming an SFN with the same SFN-ID

•Individual coverage contour is calculated for each assignment •No overall contour enclosing all these assignments •Incompatibilities between these assignments are disregarded•Incompatibilities with other requirements/assignment are calculated for each individual digital assignment

BR/TSD

Accra 2005

BCD




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2 One or more digital assignments linked to an allotment. All assignments have the same allotment ID and SFN-ID

•Interference from the requirement is the higher value from individual digital assignments or from the associated Reference Network (the latter being treated as in case 4, below).•Interference to the allotment is calculated at the test points that define the allotment area of the allotment (see also case 4).

BR/TSD

Accra 2005

BCD




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3 An allotment linked to a single assignment with no SFN-ID. No further assignments can be added.

•Interference is calculated from the digital assignment.•Interference to the allotment is calculated at the test points that define the allotment area.

BR/TSD

Accra 2005

BCD




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4 An allotment with no linked assignments

•Interference from the allotment is calculated using the associated Reference Network, located at each test point defining the allotment area•Interference to the allotment is calculated at the test points that define the allotment area of the allotment.

BR/TSD

Accra 2005

BCD



•All existing and planned assignments to other primary services will be taken into account for those administrations that do not participate at the conference (no requirements submitted)•All existing and planned assignments to other primary services will be excluded for participating administrations, unless they provide specific indications to the contrary

Other primary services

BR/TSD

Accra 2005

BCD



•In the absence of effective antenna heights use:•Aircraft stations in the aeronautical radionavigation service – 10 000 m•Land stations in the aeronautical radionavigation service – 37.5 m•Stations in the fixed service – 37.5 m•Base stations in the land mobile service – 37.5 m

•In the absence of ERP values, use the sum of power delivered to the transmit antenna and the antenna gain


BR/TSD

Accra 2005

BCD



•For the fixed service:•If the calculated beam width is smaller by 10 degrees from the specified one then use the calculated value•If the calculated azimuth of maximum radiation differs by more than 3 degrees from the specified value, use the calculated azimuth•Antenna is considered to be non-directional if the gain is less than 3.7 dB•Unspecified polarization “U” is used if no polarization is given

•Use generic service type codes where none are given and specific codes cannot be associated with the assignment•Limit the service area to the national border of the administration responsible for the assignment


BR/TSD

Accra 2005

BCD


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