Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks...
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![Page 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 &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/1.jpg)
Frequency Sharing Study between FWA & FSS in the band
5725 - 5875 MHz
David BryantWireless Networks
Presentation to UK W-LAN Advisory Group(Sharing & DFS sub-group)9th December 2002
![Page 2: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/2.jpg)
© British Telecommunications plc, 2002 2
Sharing Studies performed Aggregate effect of FWA terminals radiating into
representative FSS satellite receivers
- INTELSAT IX (31.5o West) > 5850 MHz only
- Statsionar Express (14o West) - whole band
- INTELSAT VII (66o East) > 5850 MHz only
Effect of FSS earth station transmissions on FWA receivers
FWA: Mesh & Point-to-Multipoint systems considered
![Page 3: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/3.jpg)
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 pathsInterference signal paths
Uplink FSS path
FWAOutdoor Terminals
GSO Orbit
Minimum elevation ~4 degrees
![Page 4: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/4.jpg)
5GHz ‘Band C’ Spectrum Allocations
* Short range indoor data links + CCTV + movement detectors max 25 mW eirp.** Road Transport & Traffic Telematics.
RR Allocation
s
Frequency (MHz)57505725
Other service
s(UK &
Europe)5775 5825 5850
ISM
RADIOLOCATION Amateur
5875
Fixed Satellite Service (R1)(Earth-to-space)
FSMOBILE
SRDs* SRDs
FSS (Global)(Earth-to-
space)
5800
FS (Footnotes 5.453, 5.455, 5.456) Not UKLand Mobile (UK) (Footnote 5.451)
5795
5815
RTTT**
Fixed & transportable video links
UK nominalchannel
allocationsfor FWA
(under discussion)
20 MHz channel spacing
O/B(Max eirp 40 dBW, 20 MHz BW)
![Page 5: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/5.jpg)
Parameter Value Source
Maximum mean EIRP 1 Watt ETSI TR 102 079
On-axis gain 10 dBi “
Off-axis gain envelope(gain @ elevation angle)
-25 dBi @ 60o-90o
-15 dBi @ 40o-60o
“
Off-axis gain (0o –40o) See Figure European AntennasVertical Omni
Mounting Roof-top -
Bandwidth 22 MHz ETSI TR 102 079
Radio Access TDD/TDMA “
Modulation OFDM “
Polarisation Linear (vertical) “
Peak-to-average power 6 dB “
Total Tx activity/node 5% “
Rx sensitivity (lowest) -78 dBm “
C/I 11 “
Maximum tolerableinterference
-89 dBm -
Table of ETSI FWA Mesh Radio Parameters for use in FSS Sharing Studies
UK draft spec in IR2006 is 2 Watts
![Page 6: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/6.jpg)
Table of ETSI FWA PMP Radio Parameters for use in FSS Sharing Studies
Parameter Base Station Subscriber Terminal Source
Maximum peak EIRP 1 Watt 1 Watt ETSI TR 102 079
Reduction due toAutomatic Power Control
5 dB 5 dB “
On-axis gain 15 dBi 18 dBi “
Off-axis gain envelope(gain @ elevation angle)
See Figure See Figure European AntennasSectoral & Flat-plate
Mounting 0o elevation Some of these are mountedunder eaves, and indoors
ETSI TR 102 079
Bandwidth 22 MHz 22 MHz “
Radio Access TDD/TDMA TDD/TDMA “
Modulation OFDM OFDM “
Polarisation Linear (vertical) Linear (vertical) “
Duty ratio 60% 3% “
Rx sensitivity (mean) -88 dBm -85 dBm “
![Page 7: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/7.jpg)
© British Telecommunications plc, 2002 7
Calculation of interference into satellite link
%xT
T
link
link
. . . . . . . . . . . . (1)
where,Tlink : apparent increase in the equivalent satellite link noisetemperature due to an interfering emission (K);
Tlink : the equivalent satellite link noise temperature (K)
x = 1%, 6% & 10%
• Standard method (used in satellite inter-coordination)
![Page 8: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/8.jpg)
© British Telecommunications plc, 2002 8
Calculation of interference into satellite link(cont.)
• Gr , l : fairly insensitive to FWA location (in N.W. Europe)
• , Gr , Tlink : obtained from Satellite Advanced Filing Information(this should lead to conservative results)
• Work out maximum aggregate EIRP tolerable from FWA systems
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© British Telecommunications plc, 2002 9
Elevation Plane Radiation Patterns for FWA Antennas at 5.8 GHz
Mesh Antenna:
Source: www.european-antennas.co.uk
![Page 10: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/10.jpg)
© British Telecommunications plc, 2002 10
Elevation Plane Radiation Patterns for FWA Antennas at 5.8 GHz
Point-to-MultipointSubscriber Unit Antenna
Point-to-MultipointBase StationSectoral Antenna
Source: www.european-antennas.co.uk
![Page 11: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/11.jpg)
Blue ring shows points where an FWA terminal or base station antenna would subtend an elevation angle of 20o to the Region 1 Statsionar Express Satellite in Geostationary Orbit at 14o West longitude
(global beam not shown)
![Page 12: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/12.jpg)
Blue ring shows points where an FWA terminal or base station antenna would subtend an elevation angle of 5o to the INTELSAT VII satellite (IS-704) in Geostationary Orbit at 66o East longitude (uplink hemi-beam
also shown)(N.B. this satellite only operates in the portion of the band above 5850 MHz)
![Page 13: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/13.jpg)
© British Telecommunications plc, 2002 13
Maximum No. of FWA devices deployable
39
,21
0,8
11
6,5
35
,13
5
9,0
32
,64
6
5,4
19
,58
8
90
3,2
65
1,8
06
,52
9,1
83
1,0
83
,91
7,5
10
18
0,6
52
,91
8
65
,35
1,3
51
10,000
100,000
1,000,000
10,000,000
100,000,000
1,000,000,000
10,000,000,000
10 6 1
Increase in Satellite Link Noise Temperature due to FWA Emissions (%)
No
. o
f F
WA
De
vic
es
pe
rmit
ted
FWA Mesh (ETSI spec.)
FWA PMP cells
FWA PMP Subscriber Units
Satellite: Statsionar Express 2 @ 14o WestRange of elevation angles from the UK: 23o-33o
![Page 14: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/14.jpg)
© British Telecommunications plc, 2002 14
Maximum No. of FWA devices deployableSatellite: INTELSAT IX @ 31.5o West (>5850 MHz only)
Range of elevation angles from the UK: 20o-28o
11,7
04
,04
4
1,9
50
,67
4
99
5,1
69
59
7,1
01
99
,51
7
19
9,0
33
,77
2
119
,42
0,2
63
19
,90
3,3
77
19
,50
6,7
39
10,000
100,000
1,000,000
10,000,000
100,000,000
1,000,000,000
10 6 1
Increase in Satellite Link Noise Temperature due to FWA Emissions (%)
No
. o
f F
WA
De
vic
es
pe
rmit
ted
FWA Mesh (ETSI spec.)
FWA PMP cells
FWA PMP Subscriber Units
![Page 15: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/15.jpg)
© British Telecommunications plc, 2002 15
Maximum No. of FWA devices deployableSatellite: INTELSAT VII @ 66o East (>5850 MHz only)
Range of elevation angles from the UK: 4o-7o
64
,28
9
10
,71
5
16
,18
3
9,7
10
1,6
18
3,2
36
,58
8
1,9
41
,95
3
32
3,6
59
10
7,1
49
1
10
100
1,000
10,000
100,000
1,000,000
10,000,000
10 6 1
Increase in Satellite Link Noise Temperature due to FWA Emissions (%)
No
. o
f F
WA
De
vic
es
pe
rmit
ted
FWA Mesh (ETSI spec.)
FWA PMP cells
FWA PMP Subscriber Units
![Page 16: Frequency Sharing Study between FWA & FSS in the band 5725 - 5875 MHz David Bryant Wireless Networks Presentation to UK W-LAN Advisory Group (Sharing &](https://reader035.fdocuments.in/reader035/viewer/2022062719/56649eca5503460f94bd8cc5/html5/thumbnails/16.jpg)
© British Telecommunications plc, 2002 16
Effect of aggregate interference on C/I of FSS carrier
Real example, UK - Hong Kong satellite circuit via 66o
East Satellite C/Nup = 22.7 dB;
C/Ndown = 15.52 dB;
C/Nintermod = 30 dB;
C/Nother interference = 27 dB;
Gives at the distant receiving earth station, C/Ntotal = 14.4 dB;
Wanted carrier bandwidth: 27 MHz
When the effects of the FWA interference are included, i.e.,
EIRPFWA in bandwidth of 20 MHz = 33.5 dBW for Tlink/Tlink = 10%
Wanted earth station uplink EIRP (in bandwidth of 27 MHz) = 76.8 dBW
C/IFWA = 43.3 dB
Hence, the aggregate effect of the FWA devices has a quite negligible impact on the qualityof the satellite circuit.
• Single example but T/T of 10% doesn’t seem too onerous
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Locations where an FWA Mesh receiver could suffer excessive (Long-term) interference in the band 5850 – 5875 MHz fromEarth station transmissions at Martlesham Teleport Earth Station in East Anglia
(Earth station antenna pointing towards ISVII satellite at 66o 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).
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© British Telecommunications plc, 2002 18
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.