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Three different modes are available for calculating the maximum radius .
- User-defined radius allows directly entering the maximum radius (See Annex A13.1.1);
Figure 155151: User-defined coverage radius dialog boxAnchor F155F151F155 F151
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Table 16: Description on User-defined coverage radiusAnchor T016 T016
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Description | Symbol | Type | Unit | Comments |
Coverage radius | Rmax | Scalar | km | The coverage radius defines the coverage of the system, i.e. the maximum distance between an ILT and a ILR or between a VLT and a VLR.
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- The noise-limited network option will calculate the coverage radius based on the formula for noise-limited network. If this option is chosen, a set of input boxes will appear below allowing the user to enter specific parameters required for this calculation. In this case it is considered that the coverage of the transmitter is limited only by propagation losses and other elements in thelink budget, with received signal operating at the sensitivity limit. The details of the calculation are given in Annex A13.1.2.
Figure 156152: Noise limited network coverage radius dialog boxAnchor F156F152F156 F152
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The coverage radius in the noise-limited network is defined by the parameters of Table 17. Note that the input parameters for the Noise-limited network interface are set to zero by default in order to independently define the radius from some parameters set elsewhere in the link.
Table 17: Description of the Noise limited network coverage radius user interfaceAnchor T017 T017
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Description | Symbol | Type | Unit | Comments |
Reference antenna height (receiver): | h0 |
Scalar | m | The height used for coverage radius calculations. If a distribution is used to define the real height, the coverage radius would be different in each trial, here the value may be fixed. |
Reference antenna height (transmitter): | h0 |
Scalar | m | The height used for coverage radius calculations. |
Reference frequency | fVLR |
Scalar | MHz |
Reference power | PVLT |
Scalar | dBm |
Minimum distance |
km |
Maximum distance |
km |
Availability |
% |
Fading standard deviation |
dB |
Reference percentage of time |
% |
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- Traffic-limited network option will calculate the coverage radius, based on the formula for traffic-limited network. If this option is chosen, a set of input boxes will appear below allowing user to enter specific parameters required for this calculation (See Annex A13.1.3).
Anchor F157F153 F157
FigureF153 157153: Traffic limited network coverage radius dialog box
Table 18: Description of the traffic limited network coverage radius user interfaceAnchor T018 T018 Description
Symbol
Type
Unit
Comments
Density
Scalar
1/km2
Maximum number of active transmitters per km2
Number of channels
Scalar
Number of frequency channels of the system
Number of users per channel
Scalar
Number of MS per frequency channel
Frequency cluster
Scalar
Size of a group of frequency channels. See Figure 180 for illustrative details.
The consistency of this parameter should be verified against the sensitivity, so that if a receiver is placed at given distance (e.g. at the maximum coverage radius) the received power is higher than the sensitivity for a reasonable percentage of occurrences (availability).
- Traffic-limited network option will calculate the coverage radius, based on the formula for traffic-limited network. If this option is chosen, a set of input boxes will appear below allowing user to enter specific parameters required for this calculation (See Annex A13.1.3).