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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); 

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Figure 151: User-defined coverage radius dialog box

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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.


The origin point of the coverage radius is logically the VLT or the ILT.



    • 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.

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Figure 152: Noise limited network coverage radius dialog box

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Description

Symbol

Type

Unit

Comments

Reference antenna height (receiver):

h0

SScalar

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

SScalar

m

The height used for coverage radius calculations.

Reference frequency

fVLR

SScalar

MHz


Reference power

PVLT

SScalar

dBm


Minimum distance



km


Maximum distance



km


Availability



%


Fading standard deviation



dB


Reference percentage of time



%




    • 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). 
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      Figure 153: Traffic limited network coverage radius dialog box

       

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      Table 18: Description of the traffic limited network coverage radius user interface


      Description

      Symbol

      Type

      Unit

      Comments

      Density

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      Scalar

      1/km2

      Maximum number of active transmitters per km2

      Number of channels

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      Scalar


      Number of frequency channels of the system

      Number of users per channel

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      Scalar


      Number of MS per frequency channel

      Frequency cluster

      Image Modified

      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).