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Engineering reportRestack channel planningBrisbaneENGINEERING REPORT TPS2012/07
SEPTEMBER 2012
CanberraPurple BuildingBenjamin OfficesChan Street Belconnen ACT
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© Commonwealth of Australia 2012This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from the Commonwealth. Requests and inquiries concerning reproduction and rights should be addressed to the Manager, Editorial Services, Australian Communications and Media Authority, PO Box 13112 Law Courts, Melbourne Vic 8010.
Published by the Australian Communications and Media Authority
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Executive summary 1
Proposed channel allotments 2
1 Introduction 31.1 Scope 31.2 Channel planning principles 31.3 Channel block identifications for the Brisbane licence area 41.4 Consultation 41.5 Terminology 41.6 Transmitter specifications 5
2 Block identification and channel allotment proposals 62.1 Background 62.2 High-power sites 62.3 Brisbane licence area repeater sites 7
3 Implementation/sequencing considerations 133.1 TLAP timing windows 133.2 Constraints on the restacking of sites 13
Appendix A1—Planning principles 15
Appendix A2—Proposed channel plan 17
Appendix A3—Maps 19
Appendix A4—Service-by-service constraint list 22
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Executive summary
This engineering report accompanies, and is intended to read with, documentation related to the draft television licence area plan (TLAP) for the Brisbane TV1 Licence Area. It provides background explanations for the proposed channel block identifications and channel allotments for broadcast sites and other relevant types of sites such as retransmission sites within the Brisbane TV1 Licence Area.
The proposed channel allotments are discussed in detail in section 2 of the report, and are summarised in the table following this executive summary. The proposed block identifications and channel allotments follow the restack planning principles unless specifically noted.
Section 3 of the report discusses implementation sequencing constraints that may need to be captured as events or circumstances in the draft TLAP or as licence conditions. However, the determination of restack ‘timing windows’ is not covered in this report. It is considered separately in the discussion paper for metropolitan licence area draft TLAPs that is being released together with this engineering report.
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Proposed channel allotmentsThe table below summarises the channel allotments proposed in this engineering report. These allotments will be included in the related draft TLAP instrument.
Sites shown in rows with grey shading have all retransmission services. These services are not expected to be included in the TLAP instrument. However, they have been taken into account in channel planning for the TLAP.
Channels that are allotted in the TLAP for currently operating services that will be restacked are identified by ( ).
General area served Block SBS ABC BTQ QTQ TVQ UA
Brisbane1 A (36) 7 12 6 8 11 10Sunshine Coast
South C 35 39 (53) 34 (59) 37 (56) 38 36Brisbane North West D (69) 45 41 (66) 42 43 44 40
Esk C (51) 34 39 (45) 35 (42) 37 (48) 38 36Brisbane South East B (44) 33 29 (35) 30 (41) 31 32 28
Gold Coast2 D (36) 40 (62) 41 (53) 42 (59) 45 (56) 44 43Canungra B 33 29 30 31 32 28
Currumbin2 C+E (36) 49 (62) 50 (53) 34 (59) 35 (56) 36 51Gold Coast Southern
Hinterland2 C+E (36) 49 (62) 50 (53) 34 (59) 35 (56) 36 51Kooralbyn B 33 29 30 31 32 28
Rathdowney B 33 29 30 31 32 28Boonah D (39) 40 42 (51) 41 45 (48) 44 43
Mt Alford E (67) 50 (55) 49 (58) 46 (61) 47 (64) 48 51Maroon E 46 47 48 49 50 51
1 The Brisbane CTQ38 community digital television service may be licensed to operate until 31 December 2013. Arrangements beyond that date are subject to future government decisions.2 Proposed channel allotments for Northern NSW licence area services are discussed in the engineering report for Northern NSW.
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1 Introduction1.1 ScopeThis report should be read in conjunction with the draft TLAP for Brisbane, the associated discussion/explanatory papers and the related planning documents. These contain the detailed transmitter specifications consistent with the parameters assumed in conducting predictions of signal levels as part of the planning process.The legislative and regulatory background of the relevant TLAP is discussed in the metropolitan draft TLAP discussion paper.
The Brisbane TV1 licence area consists of the greater metropolitan Brisbane as well as the Gold Coast and Sunshine Coast licence area overlap regions. The main high-power transmission site in this area is Mt Coot-tha.
The digital switchover timetable has set the area covered by the Brisbane TV1 licence area and adjacent areas in the Sunshine Coast region (that are within the Regional Queensland TV1 Licence Area) to switchover on 28 May 2013 and the surrounding areas in the Northern NSW licence area to switchover on 27 November 2012. Parts of the Regional Queensland licence area not within the Sunshine Coast region included in the Brisbane Switch-Over Area completed switchover on 6 December 2011. The implementation of restack at some sites in Brisbane cannot occur before the restack of some the Northern NSW and Regional Queensland licence area sites.
This engineering report provides supporting engineering information to explain the choice of channels at sites to be included in the Brisbane TLAP. To provide a complete view of the constraints influencing channel block selection, the scope of this engineering report also includes sites providing retransmission services (both those operated by TX Australia Pty Ltd, and those operated by councils or other community organisations).
The report also analyses the constraints affecting the sequencing of the move to final restack channels but the determination of the timing window within which the transition to final digital channels must occur is covered in the discussion paper for metropolitan licence area draft TLAPs.
1.2 Channel planning principlesThe planning principles that underpin the identification of blocks and allotment of channels have been the subject of extensive consultation/discussion at the Restack Planning Advisory Group (RPAG) and then a formal public consultation. Feedback on the proposed restack objectives was broadly positive and supportive of the proposed planning objectives. In its analyses that led to the decision to incorporate the block planning approach in its planning principles, the ACMA undertook an extensive comparative analysis of two alternative planning approaches and eventually adopted the block approach over the alternative minimum moves approach.
The development of the overall restack channel plan followed a top-down approach. That is to say, high-power sites and other sites serving large populations were considered first and the most suitable channel blocks for those key sites were identified. After that, more detailed region-by-region analyses were performed to determine channel blocks for the repeater sites in each region.
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1.3 Channel block identifications for the Brisbane licence area
The identified channel block for the high-power Brisbane services was fixed as Block A by the ministerial direction to the ACMA.
Within the RPAG a collaborative process was undertaken to develop an indicative channel plan for ‘key sites’ around Australia. That process concluded that the block identifications for major surrounding regional transmitter sites around Brisbane should be: Darling Downs (Block B), Richmond/Tweed (Block B), Southern Downs (Block C) and Wide Bay (Block A). Those block allocations strongly influence the block identifications of several of the repeater sites in the Brisbane licence area. Further details of the block identification and channel allotment for all sites in the Brisbane licence area are discussed in section 2.
In addition, channel blocks for lower-power sites in Regional Queensland and Northern NSW have been identified in other engineering reports, which have been the subject of consultation with industry, through either or both formal public consultation and informal consultation at RPAG Working Group meetings. During the process of identifying channels for Regional Queensland and Northern NSW sites, Brisbane licence area sites were considered and channel planning for these sites was undertaken so that the planning principles for both regional and metropolitan area sites were simultaneously applied. Notwithstanding, the engineering report for the Brisbane TV1 licence area was developed after the consultation on the Regional Queensland and Northern NSW engineering reports. Therefore in this report the block identifications for Regional Queensland and Northern NSW sites are presented as fixed.
Section 3 uses those proposed block identifications, and knowledge of interference compatibility constraints to determine limitations or conditions that could apply to the sequence in which the restack is implemented.
Appendix A1 provides the ACMA’s planning principles.
Appendix A2 provides a channel chart that summarises the proposed channel allotments as well as current analog (where applicable) and digital channels at each site.
Appendix A3 provides colour-coded maps that illustrate the channel block identified for each transmitter site together with an indication of its expected coverage.
Appendix A4 provides a service-by-service listing of constraints on restacking each service.
1.4 ConsultationThe ACMA distributed a draft of this engineering report prior to the RPAG working group meeting on 30 May 2012 and discussed the channel planning proposals contained in the draft at that meeting.
1.5 TerminologyBlock identification and channel allotmentsTo align with terminology being adopted in TLAP instruments, this report uses the terms ‘identify’ or identification’ when referring to the proposed block of channels to be used to serve a particular area. The channels of the identified channel block are specified in the TLAP. The term ‘allotment’ is used in the TLAP and in this engineering report in relation to which channel is to be used by which broadcaster. Some channels
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will remain unallotted in the TLAP and may be available for future allotment to a new service or be made available for retransmission services operated by third parties.
Call sign for ABC servicesThe ABC has traditionally been given a unique call sign for services from main sites and off-air fed translators and a generic state-based call sign for the main metropolitan service and satellite fed services. For example, the ABC service at Brisbane has the call sign ABQ. This convention has not been rigorously applied over the years and this can lead to confusion. For the purposes of consistency, in this engineering report and draft TLAP documents, the call sign ABC has been used for all ABC services.
1.6 Transmitter specificationsDetailed transmitter specifications for each service at each site are included in separate planning data. The planning data will become a ‘living document’ that should quite closely reflect the actual operating conditions of all services within the planning area covered by the TLAP. It is intended that the planning data will be revised from time to time as better information, or changes to transmitter specifications, are advised to the ACMA. Generally, those specifications follow existing DCP3 technical specifications (except for channel changes).
3 Or licence data in the case of retransmission sites.
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2 Block identification and channel allotment proposals
2.1 BackgroundThis section of the engineering report describes how the proposed channel blocks were identified for each area and explains the proposed channel allotments within each identified block. In addition to the normal consideration of avoiding or minimising predicted interference between services, channel allotments have been made in accordance with the ACMA’s planning principles unless specifically noted in the discussion in this section. The planning principles are reproduced in Appendix A1.
Selection of channel blocks and channel allotments has been done in accordance with planning principles 4 and 5 in all cases. In the selection of channel blocks the ACMA has been guided by the need to avoid interference between services and by planning principle 7. Discussion on the rationale for particular block selections is included on a site-by-site basis in sections 2.2 and 2.3. Similarly the channel allotments within each identified block generally follow planning principle 6, but individual issues are discussed in sections 2.2 and 2.3.
In addition to the site-by-site discussion in this section, the channel allocation proposals have also been summarised in a consolidated channel chart (that also shows current analog and digital channels) in Appendix A2.
2.2 High-power sites2.2.1 Brisbane (Mt Coot-tha) Block ABrisbane (Mt Coot-tha) is the main high-power transmission site serving the Brisbane Switchover Area. At Mt Coot-tha there are three transmissions sites that are expected to transmit digital services, however, those sites are considered to be effectively co-sited for the purpose of this report.
The identified channel block for the high-power metropolitan services in Brisbane is Block A. Proposed channel allotments within this block follow planning principle 6 and are shown in Table 2.1.
The Brisbane CTQ38 community service may be licensed to operate until 31 December 2013. Arrangements beyond that date are subject to future government decisions. However, continued operation of CTQ on channel 38 will delay restack at other key sites. It would directly delay the restack of Sunshine Coast South, Currumbin, Gold Coast Southern Hinterland and Southern Downs. Southern Downs constrains the restack of a further 18 sites including the Gold Coast (Mt Tamborine site). To allow these potential delays to be avoided, an option to move the CTQ service to channel 28 after the Brisbane SBS28 analog service vacates channel 28 has been provided. Adjustments have been made to the initially proposed channel allotments at Richmond/Tweed, Murwillumbah, Sunshine Coast South and Brisbane South East to support this possibility. Adjustments were also made to initially proposed channel allotments at Southern Downs and Gold Coast (Mt Tamborine) to take this into account and to allow a full digital-digital simulcast for all service at the Gold Coast.
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2.3 Brisbane licence area repeater sitesTable 2.1 shows the proposed block identifications and channel allotments for repeater sites in the Brisbane switchover region.
block identifications have only been made for sites listed in Table 2.1. If channels for additional sites are required in future, they should fit within the framework provided in Table 2.1.
Table 2.1 Proposed channel allotments for the Brisbane region
Area Served Pol
6 7 8 9 9A 10 11 12 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Sunshine Coast South H
BTQ SB
SU
AQ
TQTV
QA
BC
Brisbane North West V UA
AB
C
B
TQ
Q
TQ
TV
Q
S
BS
Esk V SB
SB
TQ UA
QTQ
TVQ
AB
C
Brisbane H
BTQ
SB
S
Q
TQ
DA
BU
A
TV
QA
BC
CTQ
Brisbane South East V UA
AB
QB
TQQ
TQTV
QS
BS
Gold Coast H S
BS
AB
C
B
TQ
U
A
TV
Q
Q
TQ
N
EN
NB
NN
RN
Canungra H UA
AB
CB
TQQ
TQTV
QS
BS
Currumbin V B
TQQ
TQTV
QN
EN
NB
NN
RN
SB
SA
BC
UA
Gold Coast Southern Hinterland
H B
TQQ
TQTV
QN
EN
NB
NN
RN
SB
SA
BC
UA
Kooralbyn V UA
AB
CB
TQQ
TQTV
QS
BS
Rathdowney V UA
AB
CB
TQQ
TQTV
QS
BS
Boonah V
SB
SB
TQA
BC
UA
TVQ
QTQ
Mt Alford V
BTQ
QTQ
TVQ
AB
CS
BS
UA
Maroon H
SB
SA
BC
BTQ
QTQ
TVQ
UA
2.3.1 Overview discussionDuring initial RPAG consultation meetings, there was considerable discussion on the channel block identification and planning of high- and medium-power services in and around Brisbane. The channel arrangements for those high- and medium-power services are discussed in the engineering report for Regional Queensland. These consultations, and subsequent ACMA analysis, led to development of a planning framework that drove the block identifications for lower-powered sites in the Brisbane Licence Area:
> Wide Bay and Brisbane on Block A;> Sunshine Coast South services should not be co-channelled with Gold Coast
(Mt Tamborine) services;> Gold Coast (Mt Tamborine) should be broken out of the Gold Coast area SFN;> The nine planned services at the Gold Coast Southern Hinterland and Currumbin
do not need to be in a contiguous block.
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This planning framework led to the following starting point for detailed planning:> 18 channels in the Gold Coast area (for Mt Tamborine and Gold Coast Southern
Hinterland and Currumbin) need to operate on Blocks C, D and E in order to avoid Richmond/Tweed on Block B;
> Currumbin and Gold Coast Southern Hinterland services may be co-channelled with Sunshine Coast South and Sunshine Coast North services;
> In order to achieve a spectrum efficient solution, Gold Coast (Mt Tamborine) regional services should be co-channelled with Sunshine Coast North services;
> Sunshine Coast South needs to avoid Sunshine Coast North and Sunshine Coast region SFN sites (Nambour, Noosa/Tewantin and Gympie).
2.3.2 Sunshine Coast South Block CSunshine Coast South needs to avoid the regional Queensland licence area sites at Sunshine Coast North on Block E, Nambour, Noosa/Tewantin and Gympie on Block D and Darling Downs on Block B. It also desirable, though perhaps not essential, to avoid co-channelling with Richmond/Tweed on Block B. Therefore, the identified channel block for Sunshine Coast South is Block C.
The channel allocations for Sunshine Coast South follow principle 6 and maintain the currently proposed ABC39 and SBS35 digital services. To avoid the currently operating SBS36 service delaying the restack of the Sunshine Coast South site after Brisbane ASO, the unallotted channel has been aligned with that service. The QTQ and TVQ channels follow the default channel order and BTQ is allotted to the remaining channel, channel 34. The proposed channel allotments for Sunshine Coast South are BTQ34, SBS35, UA36, QTQ37, TVQ38 and ABC39.
Note: Metropolitan commercial broadcasters propose to change the HRP and to increase the maximum ERP (by 3 dB to 15 kW maximum ERP) of the Sunshine Coast South digital services. Due to potential transmission antenna limitations, this proposal may not be practical to implement until after the restack, however, all TLAP specifications for pre- and post-restack channels reflect this power increase. The proposed new ABC and SBS Sunshine Coast South digital services would also be able to operate at the greater power level.
2.3.3 Brisbane North West Block DThe Brisbane North West services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Brisbane North West needs to avoid Block B due to Darling Downs, Block C due to Sunshine Coast South which might be used to provide an off-air input feed for Brisbane North West. Additionally, Block E should be avoided due to Toowoomba (Mt Lofty). Therefore, the identified channel block for Brisbane North West is Block D.
The proposed channel allotments for Brisbane North West follow Principle 6. Since Brisbane North West may be off-air fed from Sunshine Coast South, the UA and SBS services need to be swapped to avoid adjacent channel off-air input and an n+5 issue for the SBS. Therefore, the proposed channel allotments for Brisbane North West are UA40, ABC41, BTQ42, QTQ43, TVQ44 and SBS45.
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2.3.4 Esk Block CThe Esk digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Esk needs to avoid Darling Downs on Block B, Gold Coast metro services and Brisbane North West on Block D and Toowoomba on Block E. Therefore, the identified channel Block for Esk is Block C.
However, studies found that Esk is compatible with the currently operating 15 kW ERP Brisbane CTQ38 digital service but is not compatible with the 200 kW ERP Brisbane SBS36 digital service.
The proposed channel allotments for Esk maintain the existing ABC39 digital service and avoid the operating Brisbane and Gold Coast SBS36 services. The proposed channel allotments for Esk are SBS34, BTQ35, UA36, QTQ37, TVQ38 and ABC39.
2.3.5 Brisbane South East Block BBrisbane South East needs to avoid Gold Coast on Blocks D and E, Gold Coast Southern Hinterland and Currumbin on Blocks C and E. Therefore, the only available channel block for Brisbane South East is Block B.
Given the spectrum constraints in this region and the potential for interference to existing services, the HRP and ERP of the Brisbane South East services was carefully engineered to avoid interference to the reception of co-channel Richmond/Tweed Services. Further, these HRP and ERP requirements have meant that the coverage of Brisbane South East services will be interference limited by Darling Downs and Richmond/Tweed services. To recognise that the Brisbane South East coverage is interference-limited, an advisory note indicating that protection is provided where received field strength exceeds 80 dBµV/m will be added to licences.
The proposed channel allotments for Brisbane South East follow planning principle 6 and maintain the proposed ABC29 and TVQ32 digital services. The proposed channel allotments are UA28, ABC29, BTQ30, QTQ31, TVQ32 and SBS33.
Note: There is doubt about long-term site access to the currently proposed Brisbane South East site. If an alternate site is proposed the detailed engineering (antenna pattern, ERP level, and protection notes on the licence) may need to be revised;however, the proposed identification of Block B is not expected to change.
2.3.6 Gold Coast (metro licence area services)2 Block DGold Coast metro services need to avoid Richmond/Tweed and Darling Downs on Block B, Sunshine Coast South on Block C and Sunshine Coast North on Block E. Therefore, the identified channel block for the Gold Coast metro services is Block D.
Note: Gold Coast regional services have been placed on the lower channels of Block E. This is discussed in the Northern NSW engineering report.
The proposed channel allotments for the Gold Coast metro services follow the standard order in planning principle 6, except that QTQ and UA channels have been exchanged. This aligns the UA channel with the currently operating Gold Coast NRN43 regional digital service. This will allow a full digital-digital simulcast to be provided for all Gold Coast services.
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It is noted that this channel allotment change will place the metro pattern QTQ digital service adjacent to the regional (digital) pattern NEN service. However, studies show that the potential for adjacent channel interference is negligible within the respective licence areas of these services.
The proposed channel allotments for national and metropolitan commercial services are: SBS40, ABC41, BTQ42, UA43, TVQ44 and QTQ45.
2.3.7 Canungra Block BThe Canungra digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Canungra needs to avoid Gold Coast metro services on Block D, Gold Coast regional services on Block E and Sunshine Coast South on Block C. Therefore, the identified channel block for Canungra is Block B.
The channel allotments for Canungra follow planning principle 6 and maintain the currently proposed channels which allow Canungra to commence operation on final channels. The channel allotments for Canungra are UA28, ABC29, BTQ30, QTQ31, TVQ32 and SBS33.
2.3.8 Currumbin and Gold Coast Southern Hinterland SFN2 Blocks C and EBecause of the identification of Block D and lower channels of Block E for Gold Coast (Mt Tamborine) services and given the need to avoid Richmond/Tweed on Block B, the identified channel blocks for the 9 Currumbin/Gold Coast Southern Hinterland services are Block C and the upper 3 channels of Block E. To provide equal treatment for metropolitan and regional commercial broadcasters, the identified block for the commercial broadcasters is Block C and for the unallotted channel and the national services is the upper half of Block E.
The proposed channel allotments for the metropolitan commercial and national services at Currumbin and Gold Coast Southern Hinterland are BTQ34, QTQ35, TVQ36, SBS49, ABC50 and UA51.
Note: The analysis underpinning the proposed channel allotments shown above has been based on a like-for-like restack of currently operating Currumbin and Gold Coast Southern Hinterland digital services.
Metropolitan commercial broadcasters have made a proposal to change the HRP and to increase the maximum ERP (by about 14 dB) of the Currumbin digital services. This proposal is beyond the scope of a straightforward restack of currently operating digital services, is not practical for all broadcasters to implement on an equal basis, and does not seem practical to implement until after the restack at which point Currumbin would no longer be part of an SFN with the Gold Coast (Mt Tamborine) services.
It is now understood that metropolitan commercial broadcasters are considering another proposal based on a revised antenna pattern and a more moderate ERP increase (perhaps 4 to 6 dB). The ACMA is prepared to consider such a proposal if it is supported by all broadcasters at the site and if they are prepared to fund any necessary infrastructure upgrades that may be required as a result of this proposal. If the necessary engineering and negotiation between broadcasters is unable to be completed before the finalisation of the Brisbane TLAP, this proposal could be considered as a future revision of the Brisbane and Northern NSW TLAPs.
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2.3.9 Kooralbyn Block BThe Kooralbyn digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Kooralbyn and Rathdowney are mutually compatible and do not require SFN operation. Kooralbyn needs to avoid Southern Downs on Block C and Gold Coast metropolitan antenna pattern services on Block D. This leaves Block B and Block E available at these sites. Block B is the proposed channel block as it enables these services to commence on final channels.
Use of Block B channels at Kooralbyn does not raise concerns about the tuning range capabilities of transmit of receive antennas because there is an existing Band IV analog service at Kooralbyn.
The proposed channel allotments for Kooralbyn follow planning principle 6 and maintain the current planned services. The channel allotments for Kooralbyn are UA28, ABC29, BTQ30, QTQ31, TVQ32 and SBS33.
2.3.10 Rathdowney Block BThe Rathdowney digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Kooralbyn and Rathdowney are mutually compatible and do not require SFN operation. Both sites need to avoid Southern Downs on Block C and Gold Coast metropolitan antenna pattern services on Block D. This leaves Block B and Block E available at these sites. Block B is the proposed channel block as it enables these services to commence on final channels.
Use of Block B channels at Rathdowney does not raise concerns about the tuning range capabilities of transmit of receive antennas because there is an existing Band IV analog service at Rathdowney.
The proposed channel allotments for Rathdowney follow planning principle 6 and maintain the current planned services. The channel allotments for Rathdowney are UA28, ABC29, BTQ30, QTQ31, TVQ32 and SBS33.
2.3.11 Boonah Block DThe Boonah digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Boonah needs to avoid Darling Downs on Block B, Southern Downs on Block C and Toowoomba on Block E. Therefore, the identified channel block for Boonah is Block D.
The proposed channel allotments for Boonah follow planning principle 6 and maintain the currently operating ABC42 and QTQ45 digital services. The channel allotments are SBS40, BTQ41, ABC42, UA43, TVQ44 and QTQ45.
2.3.12 Mt Alford Block EThe Mt Alford digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Mt Alford needs to avoid Darling Downs on Block B, Southern Downs on Block C, and Boonah on Block D. Therefore, the identified channel block for Mt Alford is Block E.
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The proposed channel allotments for Mt Alford follow the channel allotment order requested by TX Australia (which will hold the licences for all of these services).
2.3.13 Maroon Block EThe Maroon digital services have been planned on the basis of protection of locations where the received field strength exceeds the ‘suburban’ level.
Maroon should ultimately avoid Darling Downs on Block B, Southern Downs on Block C and Gold Coast metro services on Block D due to interference concerns. The identified channel block for Maroon is Block E.
To allow these services to commence on final channels, and to thereby to minimise costs, these services have been co-channelled with Darling Downs, Southern Downs digital services and Gold Coast (metro) analog services in the period between commencement of the Maroon digital services and the relevant restack dates. The potential for fringe interference during this interim period was considered to be acceptable.
The proposed channel allotments for Maroon follow the standard order in planning principle 6.
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3 Implementation/sequencing considerations
This section of the report introduces the concept of TLAP timing windows and discusses implementation sequencing constraints that may need to be captured as events or circumstances in the draft TLAP or as licence conditions. The determination of restack ‘timing windows’ is not covered in this report. It is discussed separately in the discussion paper for metropolitan licence area TLAPs that is being released with this engineering report.
3.1 TLAP timing windowsThe Brisbane TLAP instrument will specify the period for which each channel is allotted. For a service that must restack, the TLAP would show two entries—one for the current channel allotment and a second for the final (post-restack) channel allotment. By overlapping the periods during which the current and final (or post-restack) channels are allotted, a ‘timing window’ is created within which broadcasters can schedule the actual date for the restack of each site. For services not restacking, only one channel allotment is shown in the TLAP because the pre-and post-restack channels will be the same.
The timing window concept is being used as it is not practical to define precise restack dates in the TLAP. This is because any slippage due to equipment delivery or delays due to weather events, or opportunistic advancement of some work when other work is delayed, would require the TLAP to be varied. Broadcasters and the Program Implementation Manager will need to make adequate contingency allowances in their project planning to ensure that any applicable planning permits are obtained, and site works, equipment deliveries and the actual restack for each site occurs before the end of the timing window.
3.2 Constraints on the restacking of sitesAn analysis showing which sites need to be restacked or switched off before other sites can be restacked has been performed. The results of that analysis are summarised in Table A4.1 in Appendix A4, where current constraints (if any) are shown for each service at each site.
The restack of Brisbane market area services is not expected to commence prior to 27 November 2012 (the date of the analog switch-over in the non-overlap part of the NNSW licence area). In that event analog services in the core NNSW licence area (eg. Richmond/Tweed analog services) will not constrain the restack of Brisbane area sites so those analog services have been excluded from the analysis in this report. But to provide a complete understanding of opportunities for the restack of Brisbane area sites ahead of the Brisbane switchover market area analog switch-over, analog constraints for Brisbane area sites including Brisbane, Currumbin, Rathdowney, Kooralbyn, Sunshine Coast South and Sunshine Coast North have been included.
That analysis found that of the 14 sites4 considered in this report, 4 can operate on final post-restack channels at any time within the restack timing window for the Brisbane licence area. These are summarised in Table 3.1.
4 Broadcaster sites and sites providing retransmission services (both those operated by TX Australia Pty Ltd, and those operated by councils or other community organisations).
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Table 3.1: Sites which have broadcast services that are not constrained by currently operating ‘pre-restack’ services
Category Area(s) servedSites at which all services are operating, or will commence, on final channels
Canungra, Kooralbyn, Maroon and Rathdowney
The other 10 sites are constrained by Brisbane licence area analog or digital services or by surrounding Regional Queensland and Northern NSW licence area digital services. These are listed in Table 3.2.
Table 3.2: Sites where the restack of broadcast services is constrained by other sites
Area served Constraint (col. 2 digital sites must restack before col.1 site)
Boonah Darling DownsBrisbane Analog: BrisbaneBrisbane North West
Esk
Brisbane South East Analog: Currumbin
Currumbin (national and metropolitan commercial services)
Richmond/Tweed, Murwillumbah, Brisbane South East, Gold Coast (regional) SBS36, Gold Coast Southern Hinterland SBS36, Currumbin SBS36, Brisbane SBS36 and CTQ38Analog: Gold Coast
Esk Darling Downs
Gold Coast (national and metropolitan commercial services)
Darling Downs, Richmond/Tweed, Murwillumbah, Esk, Southern Downs, Brisbane South East, Gold Coast (regional) NRN43, Gold Coast Southern Hinterland NRN43 and Currumbin NRN43Analog: Currumbin, Rathdowney, Kooralbyn
Gold Coast Southern Hinterland (national and metropolitan commercial services)
Richmond/Tweed, Murwillumbah, Brisbane South East, Brisbane SBS36 and CTQ38, Gold Coast (regional) SBS36, Gold Coast Southern Hinterland SBS36, Currumbin SBS36,Analog: Gold Coast
Mount Alford Darling Downs, Boonah and Southern DownsSunshine Coast South
Darling Downs, Richmond/TweedAnalog: Sunshine Coast North, Sunshine Coast South
14 | acma
Appendix A1—Planning principlesNote: the wording of principles below has been adjusted to align with the terminology adopted for TLAPs.
Principle 1: Replan digital television services to use VHF channels 6–12 and UHF channels 28–51.
Principle 2: Create a digital radio sub-band, comprising VHF television channels 9 and 9A, that is clear of digital television in metropolitan and regional licence areas. Where practicable, also avoid planning new services on these channels in remote licence areas.
Principle 3: Plan for six digital channels at each transmission site, except fori) licence area overlaps where two sets of three commercial services will require channels (a total of nine channels)ii) where broadcasters operate from different sites but cover the same area.
Principles 4–6 define the essential elements of the block planning approach.
Principle 4: Plan channels so that viewers in metropolitan and regional licence areas can receive all services using a single band antenna (i.e., plan all channels in either the VHF or UHF band). Consider the benefit of single band operation in other areas on a case-by-case basis. The current polarisation of the existing transmissions in a particular band at each transmission site is to be maintained.
Principle 5: Plan all six services on channels within defined blocks of channels as follows:
Block A: 6, 7, 8, 10, 11 and 12*Block B: 28, 29, 30, 31, 32 and 33Block C: 34, 35, 36, 37, 38 and 39Block D: 40, 41, 42, 43, 44 and 45Block E: 46, 47, 48, 49, 50, and 51.* Channels 9 and 9A may be used for digital TV in some remote areas.
Principle 6: Allot channels within a block as follows:
VHF: Existing VHF services to retain current channels unless they have to move to clear channels 9 and 9A under principle 2. New or changed channel allotments do not need to follow any particular order, except in all metropolitan areas where SBS should move to channel 7. Where it is possible without moving existing services, channel 10 should be the unallotted channel to align with the metropolitan area unallotted channel.
UHF: Channel allotments should be made after considering and balancing a number of objectives including: avoiding off-air input issues (adjacent channel and N+5) avoiding changes to existing services within the block using the unallotted channel to remove restack timing constraints and manage
band edge interference potential.
If none of the above issues apply, UHF channels should be allotted in the following order: SBS, ABC, Seven (or affiliate), Nine (or affiliate), Ten (or affiliate), unallotted.
Principle 7: In selecting the channel block for a transmission site:
acma | 15
Consider the channels used by existing digital services and any information available on the operating frequency range of broadcaster transmission equipment.
Avoid use of a block outside the likely bandwidth of viewer antennas. In particular, avoid Block B where there is no current or past use of UHF Band IV channels. Where this cannot be avoided, minimise the total population affected.
Wherever sites utilise UHF channel blocks, attempt to place high-power services on lower UHF channel blocks.
Principle 8: Break up wide area single frequency networks (SFNs) known to have associated reception problems and minimise use of new SFNs where possible.
Principle 9: Plan on the basis of broadcasters using the DVB-T standard with transmission parameters of 8k, 64QAM, 2/3 forward error correction (FEC) and 1/16 guard interval.The co-channel protection ratio used for planning will be: 20 dB
The minimum median field strengths used for planning will be:
Minimum median field strengths for digital television planning (dBµV/m)
VHF (Block A)(174–230 MHz)
UHF (Blocks B and C)(526–610 MHz)
UHF (Blocks D and E)(610–694 MHz)
Rural Suburban Urban Rural Suburban Urban Rural Suburban Urban
Minimum median field strength (dBuV/m)
44 57 66 50 63 71 54 67 74
Consistent with the reconfirmation of the existing technical planning parameters, the assumed transmission parameters include an FEC of 2/3. Also consistent with the reconfirmation of the current minimum median field strengths and 2/3 FEC, a co-channel protection ratio of 20 dB will also continue to be used.
However, recognising the proposal to break up wide area SFNs in principle 8, a 1/16 guard interval has been adopted.
Principle 10: Equalise transmissions across all broadcasters as far as practicable through planning on the basis of equal ERP levels, identical antenna patterns, closely sited transmitters and all broadcasters having the same SFN arrangement.
Principle 11: Determine the timing constraints on channel availability and specify a minimum window of six months, where practicable, when both the current digital and the final digital channels are available. When all sites and timing windows are considered together, they should result in the digital dividend channels (52–69) being cleared as soon as practicable, and by the end of 2014 at the latest.
16 | acma
Appendix A2—Proposed channel planBrisbane licence area sites (including sites in Gold Coast and Sunshine Coast licence area overlap regions)
Area Served Pol
6 7 8 9 9A 10 11 12 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
Brisbane North West P V UA
AB
C
BTQ
QTQ
TVQ
SBS
Brisbane North West C V ABC
QTQ
TV
Q
BTQ
SBS
Sunshine Coast South P H BTQ
SBS
U
A
QTQ
TVQ
ABC
Sunshine Coast South C H SBS
QTQ AB
C
BTQ
BTQ
TVQ
TV
Q
QTQ
Esk P V SBS
BT
Q
U
A
QTQ
TVQ
ABC
Esk C V ABC
QTQ
BTQ
TVQ
SBS
SBS
ABC
QTQ
BTQ
TVQ
BRISBANE P H BTQ
SBS
Q
TQ
DAB
U
A
TVQ
ABC
CT
Q
BRISBANE C H BTQ
BT
TQ
QTQ
DAB
TVQ
TVQ
AB
C SB
S
SBS
CTQ
Brisbane South East P V UA
AB
C
BTQ
QTQ
TVQ
SBS
Brisbane South East C V ABC
TVQ
BTQ
QTQ
SBS
GOLD COAST P H SBS
AB
C
BTQ
UA
TV
Q
Q
TQ
N
EN
N
BN
N
RN
GOLD COAST C H SBS
NRN
TVQ
ABC
BTQ
BTQ
NRN TV
Q
QTQ
QTQ
SBS
ABC
NEN
NEN
NBN
NBN
Canungra P H UA
AB
C
BTQ
QTQ
TVQ
SBS
Canungra C H ABC
BT
Q
QTQ
TV
Q
SBS
Gold Coast Southern Hinterland P H BTQ
QTQ
TVQ
NEN
NBN
NRN
SBS
AB
C
UA
Gold Coast Southern Hinterland C H SBS
NRN
BTQ
TVQ
QTQ
ABC
NEN
NBN
Currumbin P V BTQ
QTQ
TVQ
NEN
NBN
NRN
SBS
AB
C
UA
Currumbin C V TVQ
ABC
SBS
BTQ
NRN
NRN
QTQ SB
S
NEN
BTQ
N
BN TVQ
QTQ
ABC
NEN
NBN
Kooralbyn P V UA
AB
C
BTQ
QTQ
TVQ
SBS
Kooralbyn C V ABC
BT
Q
QTQ
T
VQSB
S
QTQ
TVQ
ABC
SBS
Rathdowney P V UA
AB
C
BTQ
QTQ
TVQ
SBS
Rathdowney C V ABC
BTQ
Q
TQ
TVQ
SB
S
Boonah P V SBS
BT
Q
AB
C
UA
TV
Q
Q
TQ
Boonah C V SBS
ABC
QTQ
TVQ
BTQ
SBS
ABC
QTQ
TVQ
BTQ
Mount Alford P V BTQ
QTQ
TVQ
ABC
SB
S
UA
Mount Alford C V
ABC
BTQ
QTQ
TVQ
SBS
Maroon P H SBS
AB
C
BTQ
QTQ
TVQ
UA
Maroon C H SBS
ABC
BTQ
Q
TQ
TVQ
ABC
SBS
BTQ
QTQ
TVQ
A B C D E
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Sites in neighbouring licence areas#REF!
Area Served Pol
6 7 8 9 9A 10 11 12 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
WIDE BAY P V SBS
ST
Q
TN
Q
RTQ
ABC
U
A
WIDE BAY C VH STQ
TNQ
AB
C RT
Q
SBS
Gympie Town P H RTQ
TNQ
STQ
ABC
SB
S
UA
Gympie Town C H SBS
TNQ
SBS
ABC
ABC
TNQ
STQ
RT
Q
RTQ
ST
Q
Gympie P H SBS
AB
C
STQ
RTQ
TNQ
UA
Gympie C H SBS
SBS
ABC
TNQ
TN
Q
RTQ
STQ
ABC
STQ
RTQ
Noosa/Tewantin P V SBS
AB
C
STQ
RTQ
TNQ
UA
Noosa/Tewantin C V SBS
ABC
STQ
SBS
TNQ
RTQ
TNQ
ABC
STQ
RTQ
Nambour P H SBS
AB
C
STQ
RTQ
TNQ
UA
Nambour C H SBS
TNQ
SBS
ABC
STQ
ABC
TNQ
STQ
RTQ
RTQ
Sunshine Coast North P H RTQ
TNQ
STQ
ABC
SB
S
UA
Sunshine Coast North C H SBS
SBS
ABC
STQ
TNQ
TNQ
RTQ
ABC
STQ
RTQ
DARLING DOWNS P H UA
AB
C
STQ
RTQ
TNQ
SBS
DARLING DOWNS C H STQ
ABC
TNQ
RTQ
SBS
Toowoomba P H SBS
AB
C
STQ
RTQ
TNQ
UA
Toowoomba C H ABC
STQ
TNQ
RTQ
SBS
Toowoomba East P H SBS
AB
C
STQ
RTQ
TNQ
UA
Toowoomba East C H ABC
STQ
TNQ
RTQ
SBS
Toowoomba South P V SBS
AB
C
STQ
RTQ
TNQ
UA
Toowoomba South C V ABC
STQ
TNQ
RTQ
SBS
SOUTHERN DOWNS P H SBS
AB
C
UA
RT
Q
TN
Q
ST
Q
SOUTHERN DOWNS C H RTQ
ABC
SBS
STQ
TN
Q
Murwillumbah P V UA
AB
C
NEN
NBN
NRN
SBS
Murwillumbah C V ABC
NRN
NEN
NBN
SBS
SBS
ABC
NRN
NEN
NBN
RICHMOND/TWEED P H UA
AB
C
NEN
NBN
NRN
SBS
RICHMOND/TWEED C H ABC
NRN AB
C
NRN
NEN
NBN
SBS
SBS
NEN
NBN
A B C D E
Current or planned digital service
Current analog service
Currently operating digital radio (DAB) services
Proposed restacked digital channel allotment
Currently operating analog that will be converted to digital via a hot-swap.
Interim digital channel
18 | acma
Appendix A3—MapsNote well: The following maps provide a general indication of the areas that may be covered by each transmitter, but several important disclaimers should be noted:1. the presentation does not take account of predicted interference between
services;2. the presentation has used the CRCpredict diffraction-based coverage prediction
model; The predictions use best available information about nominal ERP levels and antenna patterns;
3. the presentation does not include an allowance for clutter losses;4. For Gold Coast and Sunshine Coast South use of metropolitan pattern antennas
has been assumed;5. Figure A3.1 presents a simple ‘max server’ presentation which, in the case of
locations in areas of overlap between two coverages, ascribes coverage to the transmitter that provides the highest ‘Band V equivalent’ field strength at the point in question. (Note: This max server presentation is based purely on field strength comparisons it does not consider whether the received field strengths are interference-free, nor does it consider viewer preferences for one site over another);
6. Figure A3.2 provides an indication of potential ‘suburban’ coverage contour of each of the Brisbane area repeater sites with the Mt Coot-tha services excluded.
These maps SHOULD NOT BE USED to provide advice about the coverage of particular transmitters. For that purpose readers should refer to the MySwitch web site at: http://myswitch.digitalready.gov.au/
acma | 19
Figure A3.1 Brisbane licence area (all services)
20 | acma
Figure A3.2 Brisbane repeater sites
acma | 21
Appendix A4—Service-by-service constraint listTable A4.1 shows analog and digital services that would constrain a service at a nominated site from moving to its final restack channel.
Note: Some services do not need to be restacked (i.e., they already operate on their final, post-restack channels) and some other services do not have any constraints and could be restacked immediately.
Table A4.1: Constraints on restack of Brisbane TV1 licence area sites
Area served Callsign
Current channel
Final channel Constraint or comment
Boonah SBS 39 40 Must restack after digital Darling Downs TNQ40 restack.
Boonah BTQ 51 41 No constraints.
Boonah ABC 42 42 No channel change required at restack.
Boonah UA 43 May not commence before digital Southern Downs RTQ43 restack.
Boonah TVQ 48 44 No constraints.
Boonah QTQ 45 45 No channel change required at restack.
Brisbane BTQ 6 6 No channel change required at restack.
Brisbane SBS 36 7 Must restack after analog Brisbane BTQ7 switch-off.
Brisbane QTQ 8 8 No channel change required at restack.
Brisbane UA 10 May not commence before analog Brisbane TVQ10 switch-off.
Brisbane TVQ 11 11 No channel change required at restack.
Brisbane ABC 12 12 No channel change required at restack.
Brisbane CTQ 38 285 May not commence before analog Brisbane SBS28 switch-off.
Brisbane North West UA 40 May not commence before digital Darling Downs TNQ40 restack.
Brisbane North West ABC 41 41 No channel change required at restack.
Brisbane North West BTQ 66 42 Must restack after digital Esk QTQ42 restack.
Brisbane North West QTQ 43 43 No channel change required at restack.
Brisbane North West TVQ 44 44 No channel change required at restack.
Brisbane North West SBS 69 45 Must restack after digital Esk BTQ45 restack.
Brisbane South East UA 28 May not commence before analog Brisbane SBS28 switch-off. Constrained by possible digital CTQ28.
Brisbane South East ABC 29 29 No channel change required at restack.
Brisbane South East BTQ 35 30 Must restack after analog Currumbin TVQ30 switch-off.
5 Interim channel
22 | acma
Brisbane South East QTQ 41 31 No constraints.
Brisbane South East TVQ 32 32 No channel change required at restack.
Brisbane South East SBS 44 33 Must restack after analog Currumbin ABC33 switch-off.
Canungra UA 28 May not commence before analog Brisbane SBS28 switch-off. Constrained by possible digital CTQ28.
Canungra ABC 29 29 No channel change required at restack.
Canungra BTQ 30 30 No channel change required at restack.
Canungra QTQ 31 31 No channel change required at restack.
Canungra TVQ 32 32 No channel change required at restack.
Canungra SBS 33 33 No channel change required at restack.
Currumbin BTQ 53 34 No constraints.
Currumbin QTQ 59 35Must restack after digital RICHMOND/TWEED NEN35, Murwillumbah NEN35, Brisbane South East BTQ35 restack.
Currumbin TVQ 56 36Must restack after digital Gold Coast metro SBS36, Gold Coast Southern Hinterland SBS36, and Brisbane SBS36 restack.
Currumbin SBS 36 49 Must restack after analog Gold Coast metro ABQ49 switch-off.
Currumbin ABC 62 50 No constraints.
Currumbin UA 51 May not commence before analog Currumbin NEN51 switch-off.
Esk SBS 51 34 Must restack after digital Darling Downs STQ34 restack.
Esk BTQ 45 35 No constraints.
Esk UA 36 May not commence before digital Gold Coast metro and Brisbane SBS36 restack.
Esk QTQ 42 37 Must restack after digital Darling Downs ABC37 restack.
Esk TVQ 48 38 No constraints.
Esk ABC 39 39 No channel change required at restack.
Gold Coast metro SBS 36 40
Must restack after digital Darling Downs TNQ40, RICHMOND/TWEED SBS40, Murwillumbah SBS40 restack and after analog Rathdowney ABC40 switch-off.
Gold Coast metro ABC 41 May not commence before digital Brisbane South East QTQ41 restack.
Gold Coast metro BTQ 53 42 Must restack after digital Esk QTQ42 restack and after analog Currumbin NRN42 switch-off.
Gold Coast metro UA 43
May not commence before digital Gold Coast reg NRN43, Southern Downs RTQ43, Gold Coast Southern Hinterland NRN43, Currumbin NRN43 restack or before analog Kooralbyn TVQ43 switch-off.
Gold Coast metro TVQ 56 44 Must restack after digital Brisbane South East SBS44 restack.
Gold Coast metro QTQ 59 45Must restack after digital Southern Downs ABC45, Esk BTQ45 restack and after analog Currumbin QTQ45 switch-off.
acma | 23
Gold Coast Southern Hinterland BTQ 53 34 No constraints.
Gold Coast Southern Hinterland QTQ 59 35
Must restack after digital RICHMOND/TWEED NEN35, Murwillumbah NEN35, Brisbane South East BTQ35 restack.
Gold Coast Southern Hinterland TVQ 56 36 Must restack after digital Currumbin SBS36, Gold
Coast metro SBS36, and Brisbane SBS36 restack.Gold Coast Southern Hinterland SBS 36 49 Must restack after analog Gold Coast ABC49
switch-off.Gold Coast Southern Hinterland ABC 62 50 No constraints.
Gold Coast Southern Hinterland UA 51 May not commence before analog Currumbin
NEN51 switch-off.
Kooralbyn UA 28 May not commence before analog Brisbane SBS28 switch-off. Constrained by possible digital CTQ28.
Kooralbyn ABC 29 29 No channel change required at restack.
Kooralbyn BTQ 30 30 No channel change required at restack.
Kooralbyn QTQ 31 31 No channel change required at restack.
Kooralbyn TVQ 32 32 No channel change required at restack.
Kooralbyn SBS 33 33 No channel change required at restack.
Maroon SBS 46 46 No channel change required at restack.
Maroon ABC 47 47 No channel change required at restack.
Maroon BTQ 48 48 No channel change required at restack.
Maroon QTQ 49 49 No channel change required at restack.
Maroon TVQ 50 50 No channel change required at restack.
Maroon UA 51 No constraints.
Mount Alford BTQ 58 46 Must restack after digital Darling Downs RTQ46 restack.
Mount Alford QTQ 61 47 No constraints.
Mount Alford TVQ 64 48 Must restack after digital Southern Downs SBS48, Boonah TVQ48 restack.
Mount Alford ABC 55 49 Must restack after digital Darling Downs SBS49 restack.
Mount Alford SBS 67 50 No constraints.
Mount Alford UA 51 May not commence before digital Southern Downs STQ51, Boonah BTQ51 restack.
Rathdowney UA 28 May not commence before analog Brisbane SBS28 switch-off. Constrained by possible digital CTQ28.
Rathdowney ABC 29 29 No channel change required at restack.
Rathdowney BTQ 30 30 No channel change required at restack.
Rathdowney QTQ 31 31 No channel change required at restack.
Rathdowney TVQ 32 32 No channel change required at restack.
Rathdowney SBS 33 33 No channel change required at restack.
24 | acma
Sunshine Coast South BTQ 53 34Must restack after digital Darling Downs STQ34 restack and after analog Sunshine Coast North SBS34 switch-off.
Sunshine Coast South SBS 35 35 No channel change required at restack.
Sunshine Coast South UA 36
May not commence before digital Noosa/Tewantin SBS36, Nambour SBS36, Gympie Town SBS36, Gympie SBS36, Brisbane SBS36, Gold Coast SBS36, Sunshine Coast North SBS36 restack.
Sunshine Coast South QTQ 59 37Must restack after digital Darling Downs ABC37, RICHMOND/TWEED NBN37 restack and after analog Sunshine Coast South QTQ37 switch-off.
Sunshine Coast South TVQ 56 38 Constrained by digital Brisbane CTQ38
Sunshine Coast South ABC 39 39 No channel change required at restack.
acma | 25
