Within SignalPro we have several different ways to apply excess clutter pathloss. To include a clutter loss option you will need to be sure to “switch on” the appropriate option from within the propagation model menu. You can get to the propagation model menu by going to Studies>Propagation models. This is what the menu will look likeSee dialogue box below:
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Each clutter option does something is different and what you will want to use will depend depends on the system/scenario that you are modeling. There are 3 options:
Add Clutter Loss
Add clutter pass-through loss
Add clutter height to terrain height
These three options control how excess pathloss is applied for the clutter. Each option uses different values from within the attenuation file.
Please note: If you
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make changes to the attenuation file for a certain value,
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for example Loss from clutter at receiver
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, and your study results
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are not affected
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, this could
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be a result of using a clutter loss that does not correspond to the value that was changed in the attenuation file.
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Description of clutter loss options:
The Add Clutter Loss option applies a fixed amount of additional pathloss based on the clutter type at the UE/mobile unit only (this does not look at clutter along the path). The 'Loss from clutter at receiver' table within the attenuation file adjusts the loss taken into account at the mobile unit, but only if the 'Add Clutter Loss' option is checked. This is generally used for situations where the Transmitter sites are elevated above the clutter, but the mobile/remote unit is down within the clutter and you expect most clutter-based loss is local to the mobile.
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The 'Add clutter pass-through loss' treats the clutter as a lossy screen, evaluating . It evaluates the clutter heights along the path and applying applies excess pathloss in dB per /Km that when the line of sight path is within the height of the clutter. The amount of loss is controlled by the 'Pass-through clutter loss' table in the attenuation file. This is typically used for situations where the Transmitter transmitter tower heights are low and clutter loss could be is due to obstructions anywhere along the propagation path, instead of just local to the mobile.
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The 'Add clutter height to terrain height' option will treat the clutter as a solid obstacle to be diffracted over; excess pathloss is based on the diffraction angle as the path goes over the top of the clutter. The heights of the clutter are set in the attenuation file (assuming that you're not using a .CHT clutter height file instead). This is most often used for back-haul planning or situations where you want to treat the clutter as pessimistically as possible. If the mobile unit is below the height of the clutter this model tends to be very conservative and isn't really is not appropriate for most mobile planning.
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To help further explain these options it could be good to view how each option works in a path profile.
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Clutter loss options displayed in path profiles
Below is what a path will look like with only the Add clutter loss option switched on:
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This is a path with only Path profile with Add pass-through clutter loss switched on. As you will can see the clutter heights are taken into effect. But However, the path will pass-though the clutter and take the pass-through loss into account as explained above:
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This last path profile is with only Add clutter height to terrain height switched on. As you will notice the The clutter heights are taken into effect. However, but the path treats the clutter heights as a knife edge to diffract over, like as explained above:
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For any additional assistance with the clutter loss options, please submit a support ticket. You can use this the following link to create a support ticket: https://edxwireless.atlassian.net/servicedesk/customer/portal/2