Date: 9th March 2001
Meeting: Frequency Management Ad-hoc Group.
Document Reference: prFMAC 0301 008 0
Working Paper No: FMAC (03-1)/8
Radiocommunications Agency
Subject:
Spectrum Pricing for Fixed Point-to-Point Systems – Power Element
Contact:
Brian Harrison – Tel: 0207 211 0292. E-mail: brian.harrison@ra.gsi.gov.uk
1.
Introduction.
Since the start of this series of meetings the original proposal for deriving a power multiplier has gone
through a series of changes. At the 2001 February meeting it was agreed that the Mathcad simulation
detailed in paper prFMAC 0101 001 provided an acceptable platform for deriving areas within defined
boundary limits. Since then a series of simulations for the 4 GHz, 7.5 GHz and 13 GHz bands have
been undertaken and details were presented in a paper (prFMAC 0101 005 00) tabled at the meeting on
the 6th March, this year. Following a review of that paper the RA stated its intention to develop a
generic multiplier using all 10 dB ratios below 3.0 which was the value of the original proposed
multiplier derived from the original ‘flat earth’ approach.
2.
Calculated Averages.
Using a sample of data from prFMAC 0201 005 00 the following example illustrates how the areas
calculated within a defined boundary limit have been used to develop a generic power multiplier.
Frequency
Antenna Ht 1
Antenna Ht 2
TX EIRP
13 GHz
60 Metres
60 Metres
15 dBW
20 dBW
25 dBW
30 dBW
35 dBW
40 dBW
45 dBW
Boundary
Reference
-169 dBW
Area (km2)
10dB Ratio
596
1556
1992
2591
2943
3366
4072
3.34
1.67
1.48
1.30
1.38
In this example ratios of 1.67, 1.48, 1.30 and 1.38 would be used to calculate an overall average.
Using this approach the following averages were calculated:
-169 dBW
-150 dBW
3.
4 GHz
1.54
1.72
7.5 GHz
1.52
2.61
13 GHz
1.55
2.52
Proposal
The RA proposes that multipliers of 1.9 and 0.5 be used in conjunction with a power element of £257
to calculate the following Year 1 reference fees for 28 MHz:
System Availability
99.99% Availability with ATPC
99.99% Availability or 99.999% Availability with ATPC
99.999% Availability
28 MHz Reference Fee (Year 1)
£ 796 (£ 745)
£ 925 (£ 925)
£ 1,190 (£ 1465)
Notes 1) Original reference fee shown inside brackets.
2) See paper FMAC (00-5)/29 for an explanation of the methodology used.
RA2/FTSLU
Page 1 of 1