DVB-T and Wireless Microphone Exclusion Area Computation Through Interference Analysis

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1 SE43(11)Info 12 DVB-T and Wireless Microphone Exclusion Area Computation Through Interference Analysis Rogério Dionísio Instituto de Telecomunicações - Portugal 11th SE43 meeting, 19 September 2011 Page 1

2 Outline COGEU project Overview of SEAMCAT Exclusion area computation Case study 1: Interference from TVWS BS / UE to DVB-T Case study 2: Interference from TVWS BS / UE to DVB-T with sensing Case study 3: Interference from TVWS UE to PMSE Final comments 11th SE43 meeting, 19 September 2011 Page 2

3 At a glance: COGEU STREP Project ( Duration: Jan 2010 Dec partners EAB (RIM, Huawei) 11th SE43 meeting, 19 September 2011 Page 3

4 Exclusion Area Computation Overview of SEAMCAT 11th SE43 meeting, 19 September 2011 Page 4

5 What is SEAMCAT? SEAMCAT (Spectrum Engineering Advanced Monte Carlo Analysis Tool) is a statistical simulation model that uses a method of analysis called Monte Carlo to assess the potential interference between different radio communication systems. Developed and maintained by ECO Build on a Java platform 11th SE43 meeting, 19 September 2011 Page 5

6 SEAMCAT features Wt: Wanted transmitter Vr: Victim receiver It: Interfering transmitter Wr: Wanted receiver (srss) drss: desired Received Signal Strength irss: interfering Received Signal Strength srss: sensing Received Signal Strength 11th SE43 meeting, 19 September 2011 Page 6

7 Interference mechanism Unwanted emissions: BEM-Block Edge Mask Receiver blocking: Protection Ratio Function 11th SE43 meeting, 19 September 2011 Page 7

8 Interference computation 11th SE43 meeting, 19 September 2011 Page 8

9 Exclusion Area Computation Case study 1: Interference from TVWS BS / UE to DVB-T 11th SE43 meeting, 19 September 2011 Page 9

10 Primary user DVB-T transmitter: Frequency: 658 MHz Power: dbm Antenna height: 200 m antenna type: 0 dbi omnidirectional Antenna azimuth and elevation aligned with DVB-T receiver antenna drss DVB-T receiver: Antenna height: 10 m Antenna peak gain: 9.15 dbi Noise floor: dbm Sensitivity: dbm Reception bandwidth: 7,610 MHz 52.9 km dbm -68 dbm Propagation model (drss): ITU-R P th SE43 meeting, 19 September 2011 Page 10

11 Secondary user LTE BS transmitter: Frequency: 658 MHz Antenna height: 10 m Antenna: tri-sectored directional EIRPmax: 56 dbm Spectral emission mask (5 MHz BW): LTE UE transmitter: Frequency: 658 MHz Antenna height: 1.5 m Antenna: Omnidirectional EIRPmax: 23 dbm Spectral emission mask (5 MHz BW): 11th SE43 meeting, 19 September 2011 Page 11

12 Interference scenario For each Monte-Carlo trial: Move the relative position (x,y) of the LTE BS / UE around the DVB-T receiver Propagation model (irss): Extended Hata (below 40 km): Above roof for BS Below roof for UE ITU-R P.1546 (above 40 km) irss LTE Transmitter Co-channel interference Variable distance y Variable distance x 11th SE43 meeting, 19 September 2011 Page 12

13 Results Results for 1% of probability of interference (target C/N = 21 db): dbm Exclusion Area (0 dbm): 16 km radius cell coverage edge DVB-T Rx DVB-T Tx 11th SE43 meeting, 19 September 2011 Page 13

14 Results Results for 1% of probability of interference (target C/N = 21 db): dbm Exclusion Zone (0 dbm): 4.5 km radius cell coverage edge DVB-T Rx DVB-T Tx 11th SE43 meeting, 19 September 2011 Page 14

15 Exclusion Area Computation Case study 2: Interference from TVWS BS / UE with sensing capabilities, to DVB-T 11th SE43 meeting, 19 September 2011 Page 15

16 Interference scenario Change the relative position (x,0) of the LTE interferer (BS or UE) from the DVB-T receiver. Detection Threshold: -123 dbm Sensing bandwidth: 8 MHz srss drss LTE Transmitter irss Variable distance x 11th SE43 meeting, 19 September 2011 Page 16

17 Results Results for 1% of probability of interference (target C/N = 21 db): LTE UE LTE BS 11th SE43 meeting, 19 September 2011 Page 17

18 Exclusion Area Computation Case study 3: Interference from TVWS BS / UE to PMSE 11th SE43 meeting, 19 September 2011 Page 18

19 Scenarios User Equipment (UE) PMSE PMSE receiver PMSE transmitter Scenario 1: PMSE and TVWS UE outdoor; Building 1 User Equipment (UE) PMSE PMSE receiver PMSE transmitter Scenario 2: PMSE indoor and TVWS UE outdoor; Scenario 3: PMSE and TVWS UE indoor, but in separate buildings. 11th SE43 meeting, 19 September 2011 Page 19

20 Primary and secondary users PMSE Transmitter (W. Mic.): Frequency: 658 MHz Power: 10 dbm Antenna height: 1.5 m antenna type: λ/4 or λ/2 dipole, 0 dbi Antenna azimuth and elevation aligned with PMSE receiver antenna. PMSE receiver: Noise floor: -115 dbm Sensitivity: -95 dbm Reception bandwidth: 200 khz Antenna height: 1.5 m Antenna peak gain: 2.15 dbi Antenna: Omnidirectional LTE UE Transmitter: Frequency: 658 MHz EIRP: 23 dbm Antenna height: 1.5 m Antenna: Omnidirectional Spectral emission mask (5 MHz BW) 11th SE43 meeting, 19 September 2011 Page 20

21 Results: Co-channel interference Scenarios 1, 2 and 3 with target C/(N+I) = 20 db 11th SE43 meeting, 19 September 2011 Page 21

22 Results: Adjacent channel interference Scenario 1 with target C/(N+I) = 20 db 11th SE43 meeting, 19 September 2011 Page 22

23 Results: Adjacent channel interference Scenario 2 with target C/(N+I) = 20 db 11th SE43 meeting, 19 September 2011 Page 23

24 Results: Adjacent channel interference Scenario 3 with target C/(N+I) = 20 db 11th SE43 meeting, 19 September 2011 Page 24

25 Exclusion Area Computation Conclusions 11th SE43 meeting, 19 September 2011 Page 25

26 Final comments DVB-T: LTE downlink limits the white space area (in LOS with the DVB-T aerial antenna) Exclusion distance is 16 km for LTE BS and 4.5 km for LTE UE (0 dbm). Autonomous sensing artificially limits the maximum transmit power allowed for TVWS Devices (hidden node margin). Geo-location database allows a more efficient use of TVWS. PMSE exclusion distance: Co-channel: between 7.7 km and 13.9 km Adjacent channel (8 MHz gap): between 2.3 km and 4.3 km Second adjacent channel (16 MHz gap): between 1.2 km and 2.2 km No further improvements for channel gap above 16 MHz. 11th SE43 meeting, 19 September 2011 Page 26

27 Thank you! Questions? 11th SE43 meeting, 19 September 2011 Page 27

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