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Three different modes are available for calculating the maximum radius .

  • User-defined radius option allows you to enter directly entering the maximum radius directly (See Annex A13.1.1); 

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Figure 155151: User-defined coverage radius dialog box


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Table 16: Description on User-defined coverage radius

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Description

Symbol

Type

Unit

Comments

Coverage radius

Rmax

S

Scalar

km

Input a

The coverage radius defines the coverage of the system,

and fix it with a path loss constant or make little variation around this radius. Useful to give a fixed value for the coverage radius

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

the Victim link transmitter

 

...

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
    • of link
    • in thelink budget, with received signal operating at the
    • very
    • sensitivity limit. The
    • detailed
    • details of the calculation
    • is
    • are given in Annex A13.1.2.

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Figure 156152: Noise limited network coverage radius dialog box

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The coverage radius in the noise-limited network is defined by the parameters of Table 17. Note that the input parameter of parameters for the Noise-limited network interface are set to zero by default in purpose order to allow you to independently define the radius independently from some parameters set elsewhere in the link.

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Table 17: Description of the Noise limited network coverage radius user interface

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Description

Symbol

Type

Unit

Comments

Reference antenna height (receiver):

h0

S

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

S

Scalar

m

The height used for coverage radius calculations.

Reference frequency

fVLR

S

Scalar

MHz

 


Reference power

PVLT

S

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). 

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      Figure

    • 157

    • 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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    • S

    • Scalar

      1/km2

      Maximum number of active

    • transmitter

    • transmitters per

    • km2 

    • km2

      Number of channels

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    • S

    • Scalar


      Number of frequency channels

    • that a radio

    • of the system

    • provides 

    • Number of users per channel

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    • S

    • Scalar


      Number of MS per frequency channel

    • provided by a radio system 

    • Frequency cluster

      Image Modified

    • S

    You should check the

    • Scalar


      Size of a group of frequency channels. See Figure 180 for illustrative details.

    •  


    • The consistency of this parameter

    • with

    • should be verified against the sensitivity, so that if a receiver is placed at given distance

    • such as

    • (e.g. at the maximum coverage radius

    • ,

    • ) the received power is higher than the sensitivity for a reasonable percentage of

    • time

    • occurrences (availability).