Advanced Planning Methods and use of Modern Tools for Prediction of LTE- DVB-T2 Interference

Transcription

1 Advanced Planning Methods and use of Modern Tools for Prediction of LTE- DVB-T2 Interference Milos Pavlovic LS telcom AG, Germany MBT 2014 May 22 nd, 2014, Timisoara, Romania

2 LS telcom Based in Germany, Worldwide presence 20+ Years of Experience in Broadcast, Regulatory, Telecommunications', Utilities and Military Markets More than 250 highly specialised employees One-Stop-Company (Consultancy, Software & Hardware, Digital Mapping Data, System Integration, Support and After-Sales Services) Successfully Completed Projects (Consulting, Software Solutions and System Integration ) in more than 90 Countries Extensive Expertise and Reliability proven in numerous Engineering and Consulting Projects Market Leader and Trendsetter in Broadcast Solutions 2014 LS telcom AG LTE - DTT Interference Prediction page 2

3 Analog to Digital Switchover GE06 Frequency Plan UHF band MHz (49 channels) planned for DVB-T in Region 1 Up to 7 coverage layers (Multiplexes) Transition from analogue to digital higher number of programmes, a better quality much more spectrum efficient than analogue Analog: 1 channel = 1 TV program Digital: 1 channel = 4 to 7 programs spectrum made available by the transition of terrestrial television broadcasting from analogue to digital, especially for mobile broadband 2014 LS telcom AG LTE - DTT Interference Prediction page 3

4 Digital Dividend Introduction Definition of the Digital Dividend The Digital Dividend is the amount of spectrum made available by the transition of terrestrial television broadcasting from analogue to digital (Source: ITU Insights of spectrum decisions) Spectrum Existing analogue programmes Digital Dividend Existing analogue programmes Analogue Transmission Switchover Digital Transmission Time 2014 LS telcom AG LTE - DTT Interference Prediction page 4

5 Digital Dividend Why UHF? Lower frequency means more diffraction less shadow better wall penetration 2.1GHz 700 MHz shadow 2014 LS telcom AG LTE - DTT Interference Prediction page 5

6 Digital Dividend I Spectrum Allocation WRC 2007 Allocation of the band MHz to MS (mobile services) on a co-primary basis in ITU Region 1 MS in ch possible due to low Broadcast usage Band MHz auctioned off in several European countries as Digital Dividend Re-Planning (Re-Farming of broadcast frequencies) necessary in lot of the countries European Harmonized Band Plan MHz 2014 LS telcom AG LTE - DTT Interference Prediction page 6

7 Digital Dividend II Spectrum Demands WRC 2012 Two important agenda items Compatibility and sharing in the band MHz More spectrum for IMT at WRC-15 Input from African and Arabian countries request the allocation of the 700 MHz band during WRC MHz band not usable for MS MHz already allocated for MS in ITU regions 2 & 3 by WRC 2007 Pure BC 224 MHz, 28 CHs Digital Dividend 2 96 MHz, 12 CHs Digital Dividend 1 72 MHz, 8 CHs 470 MHz 694 MHz 790 MHz 862 MHz 2014 LS telcom AG LTE - DTT Interference Prediction page 7

8 Interference LTE versus Broadcast Basic Interference Mechanism DVB-T/T2 -TX (e.g. CH60) LTE Base Station (e.g. FDD1) C/I (Coverage Probability) Receiver Overload Wanted BC Signal Interfering LTE Signal Protection Ratio Interfering LTE Signal Blocking threshold (BC receiver) 2014 LS telcom AG LTE - DTT Interference Prediction page 8

9 DTT vs. LTE Overloading: Centre freq. Offset (MHz) Oth (dbm) Oth (dbµv/m) Conversion from dbm to dbµv/m: - Frequency 800 MHz - System gain 7 db (12 dbd antenna gain and 5 db feeder loss according to Final Acts GE06) 2014 LS telcom AG LTE - DTT Interference Prediction page 9

10 DTT vs. LTE Overloading: 400 m 2014 LS telcom AG LTE - DTT Interference Prediction page 10

11 Interference LTE versus Broadcast Co- and Adjacent Channel 2014 LS telcom AG LTE - DTT Interference Prediction page 11

12 Sharing Scenarios - National Co- and Adjacent Channel Interference Co-Channel Separation distance Broadcast in cities Mobile in rural areas Adjacent-Channel Guard Band Adjacent channel(s) blocked for DTT 2014 LS telcom AG LTE - DTT Interference Prediction page 12

13 Sharing Scenarios - International Co-Channel Interference BC - MS Example: GE06 Allotments in Belgium and Poland 61 ( MHz) 62 ( MHz) 63 ( MHz) 64 ( MHz) 65 ( MHz) 66 ( MHz) 67 ( MHz) 68 ( MHz) 69 ( MHz) 2 Scenarios Loss in the Mobile country 100km region along the border Loss in the Broadcast country Allotments along the border cannot be used 2014 LS telcom AG LTE - DTT Interference Prediction page 13

14 Interference LTE versus DVB-T2 ITU Rec. BT ( Additional correction values available for different system variants and various reception conditions) 2014 LS telcom AG LTE - DTT Interference Prediction page 14

15 Planning Tool - Requirements (I) 2014 LS telcom AG LTE - DTT Interference Prediction page 15

16 Planning Tool - Requirements (II) 2014 LS telcom AG LTE - DTT Interference Prediction page 16

17 Germany Interference Evaluation Procedure Provision 36 of the national frequency band allocation: mobile service in the MHz frequency band must not cause any interference into the broadcasting service The aim is to guarantee protection for broadcasting services in all relevant application situations particularly relevant if there is a residential area within a certain radius of a mobile service base station in the broadcast coverage area Principal interference evaluation procedure: Base Criteria: distance to populated places <= 1.1 km BC channels considered 60 to 52 Maximum permissible MS power 59 dbm Minimum protected DVB-T field strength at 1.1 km distance is derived for system variant A1 (QPSK ½) and channel 52: 41.9dBµV/m Only a few complaints due to very low usage of DTT ( < 10%) 2014 LS telcom AG LTE - DTT Interference Prediction page 17

18 UK I Interference Evaluation Procedure Initial coverage probability of the broadcast stations (UKPM method) Calculate the combined interference for broadcast and LTE stations Consider the individual interference contributions including protection ratios and/or receiving antenna discrimination using a statistical summation procedure (e.g. Schwarz &Yeh) Calculate the final coverage probability 2 different DTT reception scenarios are considered Standard Domestic Installation (SDI) Domestic Installation with Amplifier (DIA) Protection ratios are dependant on the reception scenario and the wanted DTT level All channels are considered (from channel 60 to 21) 2014 LS telcom AG LTE - DTT Interference Prediction page 18

19 UK II The DMSL Project Calculate the influence of LTE sites on Broadcast coverage in the UK Broadcast coverage provided by Arqiva (around 3600 broadcast frequencies) LTE sites/sectors provided by the mobile operators (around to LTE sectors/frequencies at current, up to possible in the final network configuration) Planning tool calculates the degradation in coverage probability All needs to be done in a highly automated mode ( Macro function) Import the BC stations and the coverage files Import the LTE stations Calculate the interfering field strength of the LTE stations Calculate the coverage probability degradation of every single affected BC station Calculate the overall coverage degradation for all stations of a certain MUX Write the required csv-output file Repeat the calculation for each MUX (up to 6) and with two different set of PRs Calculation results must be close to results from the broadcast operator 2014 LS telcom AG LTE - DTT Interference Prediction page 19

20 Milos Pavlovic Sales Manager Broadcast Mobile: +49 (0) Web: Thank you for your attention! Phone: +49 (0) Web: LS telcom AG LTE - DTT Interference Prediction page 20