DTTB Implementation Australia Results and Effects of Digital Dividend
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1 DTTB Implementation Australia Results and Effects of Digital Dividend Andrew King Director : BroadSpectrum Consultants Chair : Australian Radiocommunications Study Group 6 (Broadcasting) 25 th August 2015 Specialists in Broadcast and RF Spectrum 2014
2 Australian Terrestrial TV Licence Areas Free to air broadcasts : 2 national services 3 commercial services 1 community service (limited areas) DARWIN PERTH Metro 69 tx sites 144 pp/km 2 REGIONAL W.A. (3 sub markets) Prime (7) WIN (9, 10) South Australia Southern Cross (7,9,10) WIN SA (7,9,10) - LOXTON - MT GAMBIER Remote 175 tx sites 0.07 pp/km 2 CENTRAL IMPARJA (9,10) Southern Cross (7) ADELAIDE MILDURA Victoria (6 sub markets) PRIME (7) WIN (9) Southern Cross (10) Regional GRIFFITH 367 tx sites 6 pp/km 2 SYDNEY MELBOURNE TASMANIA (2 sub markets) WIN (9) Southern Cross (7 & 10) Queensland (7 sub markets) 7 QLD (7) WIN (9) Southern Cross (10) BRISBANE Northern NSW (6 sub markets) PRIME (7) NBN (9) Southern Cross (10) Southern NSW (5 sub markets) PRIME (7) WIN (9) Southern Cross (10) 2
3 A Variety of Transmission Facilities Medium Power UHF High Power VHF Low Power UHF infill 3
4 Roadmap Overview Preparation and Planning International and Initial Work Domestic Planning First analogue TV switch off 30 th June 2010 Last analogue TV switch off 10 th December Implementation Original Simulcast Duration Metropolitan Areas Original Simulcast Duration - Regional Areas 3. Digital Enhancement DTTB Commences 1 st January 2001 Planning Installation 4. Analogue Switch Off Planning Switch off by region 5. Digital Restack Planning Restack Spectrum Release 31 st December
5 Initial Decisions Government Decisions Broadcasters provided a 7MHz channel for digital Metros commence 1/1/01, Regionals 1/1/04 Nominally an 8 year simulcast Minimum quota of HD (20 hours / week) Triplecast (SD/HD/analogue) No multichanneling, but can multiview Technical Decisions DVB-T No Service Information cross carry (no multiplex operator) Implications for interference HD bitrate compromised by SD Audio up to 5.1 captioning 5
6 Broadcast Structure (Pre Digital) f1 f3 Broadcaster studios Studio to Transmitter Link A Tx A Tx f2 A Tx Re-tx Self- Help Operator Control Broadcaster Control Main Transmitter Translator 10m Definitional Planning Height Viewer House Manufacturer Unit Building Body Corporate 6 6
7 Broadcast Structure (Simulcast) f1,f4 f3 Broadcaster studios SD SD HD Studio to Transmitter Link 23Mbit/s SD Dec D Tx A Tx D Tx A Tx f2,f5 A Tx Re-tx Self- Help Operator Control Broadcaster Control Main Transmitter Translator 10m Definitional Planning Height Viewer House Manufacturer Unit Building Body Corporate 7 7
8 Australian DTV Growth Digital Australia established Digital Tracker Surveys (households) Digital Switchover Taskforce established Industry Sales Data (converted to households) HD capable LCD / Plasma displays reach acceptable consumer price points Media reform Package 3. Digital Enhancement 4. Analogue Switch Off 5. Digital Restack 8
9 Digital Reception Issues Interference Management Scheme Educate viewers / market to cliff effect of digital Antenna maintenance Analogue Antennas Masthead overload / high receive levels Local clutter / moisture Knife edge diffraction SFN design Same frequency, time, data mush zones Failures mean interference Receiver software design 9
10 The Digital Cliff Effect Service level Q5 Imperceptible Good reception Poor reception No reception Viewer benefit of digital Better than adequate Adequate Inadequate Q4 Perceptible QEF Case E -4 vber 2 10 ³ E xx Viewers change back to analogue -4 vber > 2 10 Q3 Slightly Annoying Cliff effect point Q2 Annoying Analogue Signal Field Strength No lock SFP ~ 1 db change in F.S. Q1 Very Annoying Q5 Q4 Q3 Q2 Q1 Q scale f(e, BER) BT b 10
11 Digital Enhancement Broadcaster review of underserved areas Gap filler planning Metropolitan Licence Area Key Issues Future-proofing, Growth areas, Building clutter Regional Licence Area Key Issues Growth areas, vegetation along riverbanks ACMA insist on suburban field strength levels TV Black spot sites converted VAST Coverage Metro areas: % Regional areas: > 98% 11
12 Analogue Switch Off Activities co-ordinated through DSTF Government Assistance Schemes Households Assistance Scheme Satellite Subsidy Scheme Monthly Transmission & Spectrum Working Group meetings Broadcaster advice on gap filler roll out co-ordination of govt resources and information Switch off Regions Legislated 6 month switch off windows Mildura test market 30/6/2010 Melbourne last major market 10/12/
13 Broadcast Structure (Digital) f4 f6 Broadcaster studios Studio to Transmitter Link Broadcaster Control D Tx Main Transmitter 10m Definitional Planning Height D Tx New Gap Filler f5 SFN f5 D Tx Translator f5 D Tx Converted Self Help Gap Filler Viewer House Manufacturer Unit Building Body Corporate 13 Summary 13
14 Yielding the digital dividend the restack & reallocation processes Spectrum Clearance Restack legislative amendments Broadcasters relocate to new digital TV channels Broadcasters start to plan infrastructure & new equipment Analog switch off Digital TV restack planning Restack completed Mid Mid End 2013 End Start Digital Dividend Green Paper Minister s media release Ministerial Direction Spectrum Sale Discussion Paper Recom to Minister Ministerial Declaration Allocation Instruments Technical Framework Spectrum Auction Issue Licences KEY Minister ACMA Broadcasters DBCDE Spectrum available for use 14
15 Restack Objectives 1 clear the digital dividend band of broadcasting services as soon as practicable; 2 plan for six digital channels at each transmission site; 3 plan for six VHF channels at all metropolitan main station sites; 4 plan such that coverage of all six channels is similar; 5 maintain or improve digital television coverage; 6 simplify viewer reception of terrestrial digital television; 7 establish spectrum planning arrangements that support future needs; 8 retain 14 MHz of spectrum in VHF Band III for possible expansion of digital radio; 9 comply with the legislated framework; 10 consistent with the minister s direction, the ACMA should wherever possible: a) minimize viewer costs and disruption; b) minimize commercial and national broadcaster costs. In licence area overlap regions, nine services per site would be planned at existing transmission sites. 15
16 Restack Planning Model Block A Block B Block C Block D Block E DAB MHz Planning Methodology Queensland study 198 transmitters in Ch needed moving Minimal moves added 46 move transmitter moves Block Model added 83 more transmitter moves But, long term benefits of block model recognised Nationwide 930 transmitters in Ch ,299 transmitters restacked including consequential moves 16
17 Success Factors The maintenance of a close working relationship between Government and Broadcasters Open communication with the public, to seek feedback on reception conditions and communicate changes The development of standards to modify a tookit of international standards to incorporate local requirements Planning each stage is key, every detail must be examined 17
18 Key Lessons Set regular reviews to examine if policy and technical goals are being achieved Survey households from an earlier stage to judge the success of the conversion Setting target dates provides a firm goal for all parties to work towards Effort is needed to educate the public from analogue to digital thinking; influencing perceptions of degraded reception ( digital cliff ), channels to services and new features Every householder s reception conditions are different, a variety of causes and solutions to reception issues need to be developed With respect to analogue switch off and the digital restack Review digital coverage before considering the size of a digital dividend Use the restack to remove legacy broadcast planning issues A single retune day can be successful only after considerable planning 18
19 Restack Result SE Qld / NNSW 19
20 Remaining Issues Heavy channel re-use has resulted in instances of interference under particular conditions ducting between Wollongong and Newcastle Sunshine Coast and Gold Coast Filters needed in receiving systems when IMT (4G) systems commence Challenge of how to transition to the next broadcast technology infrastructure 20
21 Newcastle Licence Area Restack Example Central Coast Overlap Sydney Licence Area 50 km 21
22 SBS28 Sydney TSN29 Sydney ABC30 Manly NEN32 Bouddi TCN33 Manly SBS34 Syd M B ney ABC37 B G W SBS39 Manly NBN40 Gosford NBN41 Bouddi ABC42 Manly NEN43 Gosford ATN44 Bouddi TEN45 Manly ABC46 Gosford TCN47 Bouddi C ATN48 Manly ATN49 Gosford T TEN50 Bouddi TCN52 Gosford T TEN55 Gosford T SBS58 Gosford T NEN59 B G W ATN60 Manly ATN61 B G W TCN62 B G W TCN63 Manly SBS64 Bouddi TEN65 B G W TEN66 Manly ABC67 Bouddi NBN68 B G W NEN30 Wyong NRN33 Wyong ANBN36 Newc ABC37 Newc SBS38 Newc SBS39 Wyong ABC42 Wyong NRN51 Newc NEN53 Newc NRN56 Wyong ATN60 Wyong TCN63 Wyong TEN66 Wyong NBN69 Wyong Spectrum Allocations Pre Sydney ASO Note the spectrum congestion Only 4 channels not used, but 8 channels reused Digital Dividend Spectrum Frequency (MHz) Legend Analog Digital Restacked Digital 22
23 SBS28 ATN28 Sydney Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly NEN32 Bouddi TCN33 Manly SBS34 Syd M B SBS34 B G Sydney ABC37 B G W SBS39 Manly NBN40 Gosford NBN41 Bouddi ABC42 Manly NEN43 Gosford ATN44 Bouddi TEN45 Manly ABC46 Gosford TCN47 Bouddi C ATN48 Manly ATN49 Gosford T TEN50 Bouddi TCN52 Gosford T TEN55 Gosford T SBS58 Gosford T NEN59 B G W ATN60 Manly ATN61 B G W TCN62 B G W TCN63 Manly SBS64 Bouddi TEN65 B G W TEN66 Manly ABC67 Bouddi NBN68 B G W NEN30 Wyong NRN33 Wyong ANBN36 Newc ABC37 Newc SBS38 Newc SBS39 Wyong ABC42 Wyong NRN51 Newc NEN53 Newc NRN56 Wyong ATN60 Wyong TCN63 Wyong TEN66 Wyong NBN69 Wyong Post Sydney ASO / Simulcast Block B Block C Block D Block E Digital Dividend Spectrum Frequency (MHz) Legend Analog Digital Restacked Digital 23
24 ATN28 Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly TCN33 Manly SBS34 B G Sydney ABC37 B G W TEN45 Manly ATN48 Manly NEN59 B G W ATN61 B G W TCN62 B G W TEN65 B G W NBN68 B G W ANBN36 Newc ABC37 Newc SBS38 Newc NRN51 Newc NEN53 Newc NRN56 Wyong Post Sydney Simulcast Block B Block C Block D Block E Digital Dividend Spectrum Legend 820 Frequency (MHz) Digital Restacked Digital 24
25 ATN28 Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly TCN33 Manly SBS34 B G Sydney ABC37 B G W NEN59 B G W ATN61 B G W TCN62 B G W TEN65 B G W NBN68 B G W NEN35 Newc ANBN36 Newc ABC37 Newc NRN39 Newc SBS38 Newc NRN51 Newc NEN53 Newc NRN56 Wyong Newcastle Restack Block B Block C Block D Block E Digital Dividend Spectrum Legend Frequency (MHz) * Date subject to change Digital Restacked Digital 25
26 ATN28 Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly TCN33 Manly SBS34 B G Sydney ABC37 B G W SBS40 B G W ABC41 B G W ATN42 B G W TCN43 B G W TEN44 B G W NEN46 B G W NBN47 B G W NRN48 B G W NEN59 B G W ATN61 B G W TCN62 B G W TEN65 B G W NBN68 B G W NEN35 Newc ANBN36 Newc ABC37 Newc NRN39 Newc SBS38 Newc NRN56 Wyong Central Coast Restack Block B Block C Block D Block E Digital Dividend Spectrum Legend Frequency (MHz) * Date subject to change Digital Restacked Digital 26
27 ATN28 Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly TCN33 Manly SBS40 B G W ABC41 B G W ATN42 B G W TCN43 B G W TEN44 B G W NEN46 B G W NBN47 B G W NRN48 B G W Guardband Optus Telstra Unsold Mid Band Gap Optus Telstra Unsold TBD NEN35 Newc ANBN36 Newc ABC37 Newc NRN39 Newc SBS38 Newc Spectrum Licences 1/1/ Possible EIRP 23dBm/5MHz Typical ERP 60dBm/7MHz Mobile Transmit Base Station Transmit Possible EIRP 64dBm/5MHz Block B Block C Block D Block E Digital Dividend Spectrum Legend 820 Frequency (MHz) Digital Restacked Digital 27
28 UHF Band Study post Digital Dividend Examined some typical Northern Beaches paths to translators 5km North Head (Manly) to Brookvale / North Manly 10km North Head to North Narrabeen; Bouddi to Palm Beach 25km Bouddi to Collaroy; Gosford to Bayview Examined effect of being within 5km of an IMT (4G) base station Examined effect of localised interference from mobile handsets Interference mechanisms IMT (4G) BS overloading masthead amps IMT (4G) MS (mobile handset) overloading masthead amps IMT (4G) MS Out-of-Band emissions degrading wanted DTV C/N 28
29 Adjacency to IMT (4G) in the APT 700MHz Plan 3GPP OoB Mask -25dBm/MHz 3GPP Spurious Mask -34dBm/MHz APT Spurious Mask -34dBm/MHz 29
30 Typical New Scenario ~55-81dBuV Blocks B, D, E* dBuV 760MHz*** 1kW DTV Tx 708MHz Typical powers towards Northern Beaches Manly 1kW Bouddi metro 1.275kW Bouddi regional 65W Gosford 300W Wyong 1.25kW 708MHz OoB Spec Ch51 Ch51 64dBm 4G BS Tx 4G Mobile Up to 5km 50m, (20m +8dB) 5, 10, 25 km, Suburban FS, Urban FS Note : Values calculated on clear line of sight, Assume 12dBd rx gain, 1 db cable loss to masthead amp * Per service values. Masthead amp overload calculated on 5 services plus 5dB IM margin (+12dB total) ** 4G operating max max power, likely 3 services initially (+5dB) *** Assumed 4G uses slant polarisation, 3dB allowed between wanted and unwanted 30
31 Anticipated Masthead Input Levels Max 4G Handset 50m from antenna 31
32 What Does Overload Do? Amplifier operates in a non-linear region Non-linear operation creates intermodulation distortion (IM) IM effectively reduces the wanted digital C/N (or MER) so pictures degrade 32
33 ATN28 Manly TSN29 Sydney ABC30 Manly TEN31 Manly SBS32 Manly TCN33 Manly SBS40 B G W ABC41 B G W ATN42 B G W TCN43 B G W TEN44 B G W NEN46 B G W NBN47 B G W NRN48 B G W Guardband Optus Telstra Unsold Mid Band Gap Optus Telstra Unsold TBD NEN35 Newc ANBN36 Newc ABC37 Newc NRN39 Newc SBS38 Newc Antennas and Filters 113 Possible EIRP 23dBm/5MHz Typical ERP 60dBm/7MHz Mobile Transmit Base Station Transmit Possible EIRP 64dBm/5MHz Block B Block C Block D Block E Digital Dividend Spectrum Legend 820 Frequency (MHz) Digital Restacked Digital 33
34 ACMA Advice 34
35 Lessons For Pacific Nations Australian Experience Broadcast Spectrum Congestion 4G Introduction needs filtering Ducting more evident Pacific Nation Lesson Spectrum Congestion generally not an issue Lower use of masthead amplifiers, television front end overload possible, Wanted / Unwanted likely to be greater so filtering may be needed. Refrain where possible from using top channels to make a guardband and keep adjacent services as far away as possible. Avoid channel re-use wherever possible to avoid ducting How to transition to next broadcasting technology without spectrum Should not be an issue but may require band change in some instances which would be disruptive and costly to viewers 35
36 Thank You for your attention Questions? 36
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