1. Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing & DFS sub-group) 9th December 2002

2. © British Telecommunications plc, 20022 Sharing Studies performed  Aggregate effect of FWA terminals radiating into representative FSS satellite receivers - INTELSAT IX (31.5 o West) > 5850 MHz only - Statsionar Express (14 o West) - whole band - INTELSAT VII (66 o East) > 5850 MHz only  Effect of FSS earth station transmissions on FWA receivers  FWA: Mesh & Point-to-Multipoint systems considered

3. Sharing Scenario for FSS Earth-to-space Satellite Links sharing with FWA (e.g.Mesh or P-MP) networks in the 5725- 5875 MHz frequency band FSS Satellite FSS Earth Station Wanted signal paths Interference signal paths Uplink FSS path FWA Outdoor Terminals GSO Orbit Minimum elevation ~4 degrees

4. 5GHz ‘Band C’ Spectrum Allocations * Short range indoor data links + CCTV + movement detectors max 25 mW eirp. ** Road Transport & Traffic Telematics. RR Allocations Frequency (MHz) 57505725 Other services (UK & Europe) 577558255850 ISM RADIOLOCATION Amateur 5875 Fixed Satellite Service (R1) (Earth-to-space) FS MOBILE SRDs* SRDs FSS (Global) (Earth-to-space) 5800 FS (Footnotes 5.453, 5.455, 5.456) Not UK Land Mobile (UK) (Footnote 5.451) 5795 5815 RTTT** Fixed & transportable video links UK nominal channel allocations for FWA (under discussion) 20 MHz channel spacing O/B(Max eirp 40 dBW, 20 MHz BW)

5. Table of ETSI FWA Mesh Radio Parameters for use in FSS Sharing Studies UK draft spec in IR2006 is 2 Watts

6. Table of ETSI FWA PMP Radio Parameters for use in FSS Sharing Studies

7. © British Telecommunications plc, 20027 Calculation of interference into satellite link Standard method (used in satellite inter-coordination)

8. © British Telecommunications plc, 20028 Calculation of interference into satellite link (cont.) G r, l : fairly insensitive to FWA location (in N.W. Europe) , G r, T link : obtained from Satellite Advanced Filing Information (this should lead to conservative results) Work out maximum aggregate EIRP tolerable from FWA systems

9. © British Telecommunications plc, 20029 Elevation Plane Radiation Patterns for FWA Antennas at 5.8 GHz Mesh Antenna: Source: www.european-antennas.co.ukwww.european-antennas.co.uk

10. © British Telecommunications plc, 200210 Elevation Plane Radiation Patterns for FWA Antennas at 5.8 GHz Point-to-Multipoint Subscriber Unit Antenna Point-to-Multipoint Base Station Sectoral Antenna Source: www.european-antennas.co.ukwww.european-antennas.co.uk

11. Blue ring shows points where an FWA terminal or base station antenna would subtend an elevation angle of 20 o to the Region 1 Statsionar Express Satellite in Geostationary Orbit at 14 o West longitude (global beam not shown)

12. Blue ring shows points where an FWA terminal or base station antenna would subtend an elevation angle of 5 o to the INTELSAT VII satellite (IS-704) in Geostationary Orbit at 66 o East longitude (uplink hemi-beam also shown) (N.B. this satellite only operates in the portion of the band above 5850 MHz)

13. © British Telecommunications plc, 200213 Maximum No. of FWA devices deployable Satellite: Statsionar Express 2 @ 14 o West Range of elevation angles from the UK: 23 o -33 o

14. © British Telecommunications plc, 200214 Maximum No. of FWA devices deployable Satellite: INTELSAT IX @ 31.5 o West (>5850 MHz only) Range of elevation angles from the UK: 20 o -28 o

15. © British Telecommunications plc, 200215 Maximum No. of FWA devices deployable Satellite: INTELSAT VII @ 66 o East (>5850 MHz only) Range of elevation angles from the UK: 4 o -7 o

16. © British Telecommunications plc, 200216 Effect of aggregate interference on C/I of FSS carrier  Real example, UK - Hong Kong satellite circuit via 66 o East Satellite C/N up = 22.7 dB; C/N down = 15.52 dB; C/N intermod = 30 dB; C/N other interference = 27 dB; Gives at the distant receiving earth station, C/N total = 14.4 dB; Wanted carrier bandwidth: 27 MHz When the effects of the FWA interference are included, i.e., EIRP FWA in bandwidth of 20 MHz = 33.5 dBW for  T link /T link = 10% Wanted earth station uplink EIRP (in bandwidth of 27 MHz) = 76.8 dBW C/I FWA = 43.3 dB Hence, the aggregate effect of the FWA devices has a quite negligible impact on the quality of the satellite circuit. Single example but  T/T of 10% doesn’t seem too onerous

17. Locations where an FWA Mesh receiver could suffer excessive (Long-term) interference in the band 5850 – 5875 MHz from Earth station transmissions at Martlesham Teleport Earth Station in East Anglia (Earth station antenna pointing towards ISVII satellite at 66 o East longitude; 10 km NGR grid overlay)) The calculations use Rec. ITU-R P.452 to show areas (in red) where a mesh antenna located 8 metres above ground level could receive excessively high interference for 20% of the time due to emissions from the MTP-10 antenna with an assumed transmit power into the antenna feed flange of 24 dBW. The yellow area is the reduced area in which interference would occur for a 15 dB increase in coupling loss (e.g. due to additional clutter loss along the path).

18. © British Telecommunications plc, 200218 Conclusions  Sharing between the FSS and FWA systems appears favourable in the band 5725 - 5850 MHz - This is mainly due to the directional properties of FWA antennas in the elevation plane.  Top 25 MHz of Band C (5850-5875 MHz) is slightly less favourable: - Because of the low elevation angles subtended into N.W. Europe by some satellites close to the horizon.