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BR/TSD Dakar 2005 BCD Reference Planning Concept Reference Planning Configurations and Reference Networks 25 - 29 April 2005 Dakar David Botha Workshop.

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Presentation on theme: "BR/TSD Dakar 2005 BCD Reference Planning Concept Reference Planning Configurations and Reference Networks 25 - 29 April 2005 Dakar David Botha Workshop."— Presentation transcript:

1 BR/TSD Dakar 2005 BCD Reference Planning Concept Reference Planning Configurations and Reference Networks 25 - 29 April 2005 Dakar David Botha Workshop for the African Group of Countries

2 BR/TSD Dakar 2005 BCD What is an RPC? An RPC is an idealised abstract configuration of technical characteristics that can be used for conference planning purposes. An RPC describes the sum of all relevant technical aspects of a broadcasting service implementation required for planning purposes and eventually for the calculations related to plan modifications during Plan implementation. An RPC is not associated with any particular system variant or a real network, but can represent a large number of real implementations. Workshop for the African Group of Countries

3 BR/TSD Dakar 2005 BCD Why use an RPC? Thousands of planning configurations Reception modes for DVB-T: Portable reception (indoor / outdoor) Fixed reception (roof top) Mobile reception Reception modes for T-DAB: Mobile reception Portable indoor reception DVB-T System variants Modulation type and code rate (15 types) Channel bandwidth 7 and 8 MHz (15 x 2 types) Guard intervals (1/4, 1/8, 1/16, 1/32) (15 x 2 x 4 = 120 variant types) Workshop for the African Group of Countries

4 BR/TSD Dakar 2005 BCD Derivation of RPCs Table 3.6-1 Aspects of DVB T planning configurations AspectElement Reception modeFixed roof-level Portable outdoor Portable indoor Mobile Coverage quality (in terms of percentage of locations) 70% 95% 99% Network structure MFN (single transmitter) SFN Dense SFN DVB T system variant from QPSK-1/2 to 64-QAM-7/8 Frequency bandBand III (200 MHz) Band IV (500 MHz) Band V (800 MHz) Workshop for the African Group of Countries

5 BR/TSD Dakar 2005 BCD Derivation of RPCs continued Representative Planning Configurations E med ref calculated for band III (200 MHz), IV (500 MHz) and V (800 MHz) Rep. Plan. Conf. Rx mode fix po mob pi Mod.64 QAM 64 QAM 16 QAM 64 QAM QPSK16 QAM 16 QAM 16 QAM Code Rate 2/33/42/3 1/22/3 Loc. Prob. 95% 99% 70%95% Required C/N (dB) 20.121.617.222.313.015.517.2 Data capacity from to (MBit/s) 19.9 24.1 22.4 27.1 13.3 16.1 19.9 24.1 6.6 8.0 10.0 12.1 13.3 16.1 13.3 16.1 Workshop for the African Group of Countries

6 BR/TSD Dakar 2005 BCD Derivation of RPCs continued RRC-04 Reference Planning Configurations DVB T grouping in terms of reception mode: fixed reception; portable outdoor reception, mobile reception and lower coverage quality portable indoor reception; higher coverage quality portable indoor reception. For reference frequencies: 200 MHz (VHF); 650 MHz (UHF). Workshop for the African Group of Countries

7 BR/TSD Dakar 2005 BCD Derivation of RPCs continued RRC-04 Reference Planning Configurations RPC 1RPC 2RPC 3 Groupfixmob, po, pipi Plan. Conf. 64QAM 2/3 fix 95%loc 64QAM 3/4 fix 95%loc QPSK 2/3 mob 99%loc 16QAM 1/2 mob 99%loc 64QAM 2/3 po 95%loc 16QAM 2/3 po 95%loc 16QAM 2/3 pi 70%loc 16QAM 2/3 pi 95%loc C/N (dB) 20.121.613.015.522.317.2 E med ref calculated for VHF (200 MHz) and UHF (650 MHz) Workshop for the African Group of Countries

8 BR/TSD Dakar 2005 BCD Summary of RRC-04 RPCs for DVB-T RPCs for DVB T RPC RPC 1RPC 2RPC 3 Reference location probability 95% Reference C/N (dB) 211917 Reference (E med ) ref (dB(µV/m)) at 200 MHz 506776 Reference (E med ) ref (dB(µV/m)) at 650 MHz 567888 Typical data capacity (Mbit/s) 20-278-2413-16 (E med ) ref : minimum median equivalent field strength RPC 1: RPC for fixed roof-level reception RPC 2: RPC for portable outdoor reception or lower coverage quality portable indoor reception or mobile reception RPC 3: RPC for higher coverage quality for portable indoor reception. Workshop for the African Group of Countries

9 BR/TSD Dakar 2005 BCD Application of RRC-04 RPCs for DVB-T Interpolation of Reference (E med ) ref (f) Correction factor Fixed reception20log(f/fr) Portable and mobile reception 30log(f/fr) Protection ratios from ITU-R Rec. BT.1368 Representative system variant RPC 164QAM 3/4 RPC 216QAM 3/4 RPC 316QAM 2/3 Workshop for the African Group of Countries

10 BR/TSD Dakar 2005 BCD RRC-04 RPCs for T-DAB Table 3.6-3 RPCs for T DAB (E med ) ref : minimum median equivalent field strength RPC 4: RPC for mobile reception RPC 5: RPC for portable indoor reception Reference planning configuration RPC 4RPC 5 Location probability 99%95% Reference C/N (dB) 15 Reference (E med ) ref (dB(µV/m)) at 200 MHz 6066 Protection ratios in ITU-R Rec. BS.1660 Workshop for the African Group of Countries

11 BR/TSD Dakar 2005 BCD Implications when using RPCs Advantages Disadvantages Particularly useful when allotment planning is used Does not require detail planning prior to notification Allows for the selection of a specific system variant at a later stage Simplifies planning by reducing the number of configurations Not all technical criteria need be available at planning time, e.g. protection ratios Selected RPCs may not exactly represent your requirement Administration still need to make some basic decisions before planning Increase the analysis computation time if more than 36 test points are defined per allotment Workshop for the African Group of Countries

12 BR/TSD Dakar 2005 BCD What is a Reference network (RN)? An RN is an idealised representation of real network implementations. Reference networks exhibit a high degree of geometrical symmetry and homogeneous transmitter characteristics. Reference networks are characterised by the parameters: Number of transmitters Distance between transmitters Transmitter network geometry Transmitter power Transmitter antenna height Transmitter antenna pattern Service area Workshop for the African Group of Countries

13 BR/TSD Dakar 2005 BCD Why use an RN? Allotments have no transmitters associated An RN represent the interference potential of an allotment Single transmitter case Preferable to use real transmitter characteristics and assignments Reference Single Frequency Networks Generally larger service areas than a single transmitter All transmitters may not be known during the establishment of a frequency plan Compatibility analysis and synthesis based on the use of a suitable RN Plan modifications will rely on RN for allotments not yet converted to assignments Workshop for the African Group of Countries

14 BR/TSD Dakar 2005 BCD Definition of Reference Networks General design considerations: RNs defined in terms of the service application Effective antenna heights set to 150 metres Field strength prediction based on ITU-R Rec. P.1546-1 Statistical field strength summation using k-LNM method Design based on noise limited coverage, use power margin to obtain interference limited coverage Hexagonal service areas Hexagonal or triangular network configurations Open and closed network structures For open network structures the service area is 15% larger than the network structure Workshop for the African Group of Countries

15 BR/TSD Dakar 2005 BCD Definition of Reference Networks continued RN categories: Reference network 1234 ApplicationLarge service area SFN Small service area SFN, dense SFN Small service area SFN (urban) Semi-closed small service area SFN where interference should be limited Service area diameter (km) 161/115/9253/33/33 46/29/29 Distance between transmitters (km) 70/50/4040/25/25 Type of network Open Semi-closed DVB-T Workshop for the African Group of Countries

16 BR/TSD Dakar 2005 BCD Definition of Reference Networks continued RN categories: Reference network for RPC 5RPC 6 ApplicationMobilePortable indoor Service area diameter (km) 120 Distance between transmitters (km) 60 Type of networkClosed T-DAB Workshop for the African Group of Countries

17 BR/TSD Dakar 2005 BCD Implications when using RNs Advantages Disadvantages Can represent the interference potential of allotments Does not require detail planning prior to notification Allows for the selection of a specific system variant at a later stage Not all technical criteria need be available at planning time, e.g. protection ratios for specific system variants Selected RNs may not exactly represent unique requirements Administration still need to make some basic decisions before planning Considerably increase the calculation time of the analysis Workshop for the African Group of Countries

18 BR/TSD Dakar 2005 BCD Examples of RNs FIGURE A.3.7-3 RN 2 (small service area SFN) FIGURE A.3.7-7 Geometry of the RN Workshop for the African Group of Countries

19 BR/TSD Dakar 2005 BCD Notifying allotment requirements For DVB-T: Define and notify allotment geographical area (DA1) Select the band (VHF or UHF) Select the reception mode (fixed, mobile or portable, or higher quality portable indoor) Select the RPC Select the type of application (Large SFN, small SFN, small SFN urban or semi-closed small SFN) Select the RN Notify the allotment (DT2) Workshop for the African Group of Countries

20 BR/TSD Dakar 2005 BCD Notifying allotment requirements continued For T-DAB: Define and notify allotment geographical area (DA1) Select the reception mode (mobile or portable indoor) Select the RPC and RN Notify the allotment (DS2) Workshop for the African Group of Countries

21 BR/TSD Dakar 2005 BCD Thank you Merci Workshop for the African Group of Countries

22 BR/TSD Москва 2004 Workshop for CEE, CIS and Baltic States BCD


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