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Reference Planning Concept

Reference Planning Concept. Reference Planning Configurations and Reference Networks 25 - 29 April 2005 Dakar David Botha. Workshop for the African Group of Countries. BR/TSD. BCD. Dakar 2005. What is an RPC?. An RPC is an idealised abstract configuration of technical

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Reference Planning Concept

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

  2. 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 BR/TSD BCD Dakar 2005

  3. 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 BR/TSD BCD Dakar 2005

  4. Derivation of RPC’s Workshop for the African Group of Countries Aspect Element Reception mode Fixed roof-levelPortable outdoorPortable indoor Mobile Coverage quality (in terms of percentage of locations) 70%95%99% Network structure MFN (single transmitter)SFNDense SFN DVB‑T system variant from QPSK-1/2to 64-QAM-7/8 Frequency band Band III (200 MHz)Band IV (500 MHz)Band V (800 MHz) BR/TSD Table 3.6-1 Aspects of DVB‑T planning configurations BCD Dakar 2005

  5. Derivation of RPC’s continued Workshop for the African Group of Countries BR/TSD BCD Representative Planning Configurations Emedref calculated for band III (200 MHz), IV (500 MHz) and V (800 MHz) Dakar 2005

  6. Derivation of RPC’s continued 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 BR/TSD BCD RRC-04 Reference Planning Configurations Dakar 2005

  7. Derivation of RPC’s continued Workshop for the African Group of Countries BR/TSD BCD RRC-04 Reference Planning Configurations Emedref calculated for VHF (200 MHz) and UHF (650 MHz) Dakar 2005

  8. Summary of RRC-04 RPC’s for DVB-T RPC RPC 1 RPC 2 RPC 3 Workshop for the African Group of Countries Reference location probability 95% 95% 95% Reference C/N (dB) 21 19 17 Reference (Emed)ref (dB(µV/m)) at 200 MHz 50 67 76 Reference (Emed)ref (dB(µV/m)) at 650 MHz 56 78 88 Typical data capacity (Mbit/s) 20-27 8-24 13-16 (Emed)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. BR/TSD RPCs for DVB‑T BCD Dakar 2005

  9. Application of RRC-04 RPC’s for DVB-T Workshop for the African Group of Countries BR/TSD BCD Interpolation of Reference (Emed)ref (f) Protection ratios from ITU-R Rec. BT.1368 Dakar 2005

  10. RRC-04 RPC’s for T-DAB Workshop for the African Group of Countries Reference planning configuration RPC 4 RPC 5 Location probability 99% 95% Reference C/N (dB) 15 15 Reference (Emed)ref (dB(µV/m)) at 200 MHz 60 66 (Emed)ref: minimum median equivalent field strength RPC 4: RPC for mobile reception RPC 5: RPC for portable indoor reception BR/TSD Table 3.6-3 RPCs for T‑DAB BCD Protection ratios in ITU-R Rec. BS.1660 Dakar 2005

  11. Implications when using RPC’s Workshop for the African Group of Countries BR/TSD BCD Advantages • 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 Disadvantages • Selected RPC’s 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 Dakar 2005

  12. 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 BR/TSD BCD Dakar 2005

  13. 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 BR/TSD BCD Dakar 2005

  14. Definition of Reference Networks General design considerations: RN’s 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 BR/TSD BCD Dakar 2005

  15. Definition of Reference Networks continued RN categories: Workshop for the African Group of Countries BR/TSD BCD DVB-T Dakar 2005

  16. Definition of Reference Networks continued RN categories: Workshop for the African Group of Countries BR/TSD BCD T-DAB Dakar 2005

  17. Implications when using RN’s Workshop for the African Group of Countries BR/TSD BCD Advantages • 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 Disadvantages • Selected RN’s may not exactly represent unique requirements • Administration still need to make some basic decisions before planning • Considerably increase the calculation time of the analysis Dakar 2005

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

  19. 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 BR/TSD BCD Dakar 2005

  20. 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 BR/TSD BCD Dakar 2005

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

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