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Empirical compatibility assessment in Poland LTE causes interference to ARNS Mateusz Berlik Office of Electronic Communications, Poland Department of Frequency.

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Presentation on theme: "Empirical compatibility assessment in Poland LTE causes interference to ARNS Mateusz Berlik Office of Electronic Communications, Poland Department of Frequency."— Presentation transcript:

1 Empirical compatibility assessment in Poland LTE causes interference to ARNS Mateusz Berlik Office of Electronic Communications, Poland Department of Frequency Resources Management ITU Regional Seminar for Europe and CIS Countries Warsaw, May 2012

2 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

3 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

4 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem MOBILE added by WRC-07

5 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem WRC-12 AI to consider results of sharing studies between the mobile service and other services in the band MHz in Regions 1 and 3, in accordance with Resolution 749 (WRC-07), to ensure the adequate protection of services to which this frequency band is allocated, and take appropriate action. MOBILE FIXEDBROADCASTING ARNS

6 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem

7 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem Two approaches proposed by CPM-12: –coordination distances: 125 – 515 km (depending on ARNS system and scenario) –coordination field strength triggers aggregate values – eg m in 6 MHz RBW for RLS1 radar; single values – eg m for ARNS terrestrial station

8 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem

9 Mateusz Berlik, UKE :: Warsaw, May 2012 Introduction to the LTE vs. ARNS problem

10 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

11 Mateusz Berlik, UKE :: Warsaw, May 2012 Aims of the measurements: to analyse an impact of the LTE system on the radar system; to determine/assess the maximum level of the interfering signal.

12 Mateusz Berlik, UKE :: Warsaw, May 2012 What did we have? 4 ARSN systems operating in Poland; agreement of the army on measurements (with some restrictions); LTE test terminals (provided by the operator); LTE signal generator (provided by Nokia Siemens Networks Poland); ARNSs system operators/service staff.

13 Mateusz Berlik, UKE :: Warsaw, May 2012 What did we NOT have? detailed knowledge about the ARNS systems; documentation of the ARNS systems; specialists in old ARNS systems; compatibility criteria(!).

14 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

15 Mateusz Berlik, UKE :: Warsaw, May 2012 Scenario LTE terminal/signal generator ARNS ground station

16 Mateusz Berlik, UKE :: Warsaw, May 2012 Object of the measurements RSP-10 MN-1 radar system: –primary (RLS1) / secondary (RLS2) radar; –only RLS1 module currently in use; –radiolocator for traffic controllers; –less than 100 km operational radius; –is going to be replaced by modern systems.

17 Mateusz Berlik, UKE :: Warsaw, May 2012 RSP-10 Radar system (RLS1)

18 Mateusz Berlik, UKE :: Warsaw, May 2012 RSP-10 Radar system (RLS1)

19 Mateusz Berlik, UKE :: Warsaw, May 2012 RSP-10 Radar system (RLS1)

20 Mateusz Berlik, UKE :: Warsaw, May 2012 RSP-10 Radar system (RLS1)

21 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

22 Mateusz Berlik, UKE :: Warsaw, May 2012 Military base Military airfield

23 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement I (Toruń, ) The radar under maintenance works; Direct connection to the radar receiver.

24 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement I (Toruń, )

25 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement I (Toruń, )

26 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement I (Toruń, ) LTE parameters: Bandwidth [MHz] ModulationQPSK16-QAM G4-76A generator settings: Reflected signal [dBm] LTE generator critical power: LTE Power [dBm] Sensitivity: dBm Pol H: E = 24.6 dBμV/m Pol V: E = 48.6 dBμV/m

27 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement II (Malbork, ) Operating radar used by military airfield in Malbork

28 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement II (Malbork, ) The radar in receive-only mode: –very optimistic results (allowable interference > 50 dBµV/m); Received interferences level dramatically higher when it works in regular send-and- receive mode; –there was no ability to repeat the measurements.

29 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement III (Toruń, ) Operating radar (after maintenance works); Measurements similar to ones performed in Malbork; LTE terminals as interfering transmitters.

30 Mateusz Berlik, UKE :: Warsaw, May 2012 RSP-10 Radar system (RLS1)

31 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement III (Toruń, )

32 Mateusz Berlik, UKE :: Warsaw, May 2012 Measurement III (Toruń, ) Measure No. Received power [dBm] Field strength at receiving point [dBμV/m] Distance [m]Frequencies 1-95,235,5706 RSP-10: 835 MHz LTE: MHz 2-96,534, RSP-10: 835 MHz LTE: MHz 3-96,334, RSP-10: 835 MHz LTE: MHz 4-80,350,4128 RSP-10: 835 MHz LTE: MHz 5-69,761,0128 RSP-10: 835 MHz LTE: MHz

33 Mateusz Berlik, UKE :: Warsaw, May 2012 Agenda Introduction to the LTE vs. ARNS problem Aims and conditions of the measurements Radio systems under tests Measurements action Summary

34 Mateusz Berlik, UKE :: Warsaw, May 2012 Summary Because of the lack of the technical compatibility criteria, it was difficult to use the results as a point in discussion. General conclusions: –LTE terminal does really interfere RSP-10 radar; –allowable interference field strength is probably higher than protection level from the CPM-12 Report. The results were useful for our administration.


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