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EDX SignalPro has the capability of tuning your propagation model. Model tuning is one of the final steps a user could can take to more accurately represent what is going on in the real world and complete or finish their design. Model tuning is the process of taking real life measurement drive test data and comparing that with predictions in SignalPro. The user takes these comparisons and is given a suggested new best fit loss for each associated clutter category. This new loss is meant to be the most accurate representation of your clutter attenuation values based on the users drive test data, or what's in the real world. A user would want to do this so that they can follow these steps in order to more accurately design a live or potential RF system/design.
The user must first obtain valid measurement drive test data. This is done by capturing RSSI values with a scanner while driving through a predetermined drive test route with the appropriate setup. This The drive test route should include a variety of areas of with different morphologies around the site to allow for varying RF conditions to be captured. This Variation will help for losses to be more accurately represented in the propagation model, which in turn will reflect as close as possible of a reflects a close real world scenario in your RF design. Once the drive test data is recorded the user will need to construct a new file to containing that measurement data. This file can will be created in the specific EDX measurement data format. You can read more about this the format here: Creating Measurement/Drive Test Files for EDX
There are two options for model tuning within SignalPro. Both can be found from within the Propagation Models menu. The two options are called Test Against Measurement and Tune Pass-through Loss, they are highlighted in the image below:
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Test Against Measurement: This option only applies if the user has the “Add Clutter Loss” checkbox switched on/active. Press Click the test against measurement button to bring up this dialogue:
From here you will press click “Browse…” to point to your properly formatted measurement drive test data file. The measurement file type may be left as EDX, if that is the format you have assembled your measurement data in. You will want to select Select the appropriate sector and mobile/remote unit. Its important to note just in case missed, the
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Please note: The EDX measurement drive test data format is specific to a single sector only. |
Then
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press Run Analysis
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. You will be presented with the Measured vs Predicted dialogue box:
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Please note |
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: These values are not relevant. This measurement data was fabricated for the purpose of this article. |
From here you can select or deselect the various categories you want to tune and you can press . Press the “Auto Tune” button to do so. This will adjust the loss value for the clutter categories selected so that they more accurately represent the drive test data. You will want to press “Save As..” to make a new copy of the original clutter attenuation file being used. You can then Then use this new clutter attenuation file with the edited loss values within your project.
2. Tune Pass-Through Loss: This option for model tuning only applies when the user has the “Add Clutter Pass-Through Loss” option check on/active from within the propagation models menu. You will only be able to tune your model if this option is selected, you cannot have both add clutter loss and clutter pass through loss selected. The measurement file format will still be the same. When pressing the Tune Pass-Through Loss button you are presented with a new dialogue box:
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First you will want to look in In the “Details” section and box be sure to set your sample spacing for pathloss prediction similar to the clutter resolution being used in the project. You will select Select the appropriate sector under the “Using Transmitter:” drop down menu. You will also Also select your mobile unit/receiver just below that. Then similarly to Test Against Measurement, you will press click choose data file to browse for your properly formatted measurement drive test data file. Once you select your appropriate measurement file has been selected, the menu will begin to load the data. This can may take a few moments. Once the file has been loaded the menu should populate something similar to thisas pictured below:
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Again, similar to test against measurement, this process is specific to one sector at a time. You can go through and select which clutter categories you do and do not want to tune. When Once you are ready to tune a clutter category you will press click the Tune Pass-through Clutter Loss button. You will want to press Then click “Save As” to save a copy of the edited clutter attenuation file. You may then utilize this edited clutter attenuation file within your design.
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