RF Predictive Modeling

IMPORTANT: Predictive modeling is available to Pro License users only.

In addition to the surveys based on actual on-site measurements, TamoGraph can be used for planning WLANs that have not been deployed yet. This type of planning is called "predictive" or "virtual," because Wi-Fi characteristics are predicted for the virtual environment model created by the user. The process of creating and adjusting the virtual environment, selection and placement of simulated APs, and analysis of the resulting WLAN is commonly referred to as "RF planning" ("RF" stands for Radio Frequency).

To create a predictive RF model, you need to:

• Create a new project with the help of the Project Wizard.
• Calibrate the floor plan or site map.
• Configure the survey options and WLAN requirements.
• Create a model of the environment. This includes placing walls and other obstructions on the floor plan, as well as placing APs and editing their properties.

To create a virtual model of the environment, the user needs to “tell” the application about the position, size, and type of the physical objects that affect radio wave propagation. Typically, walls and other obstructions, such elevator shafts, are already shown on floor plans; however, these are merely lines and dots that are meaningless to the application. The user has to draw such physical objects on top of the floor plan and define their characteristics.

To start creating a virtual model, press the RF Planner button on the tool bar. This will show an additional tool bar with a few drawing tools. It is recommended to begin by drawing walls. Once the walls have been drawn, you can place APs on the floor plan, decide how many APs you need to provide adequate coverage, select the best positions for the APs, and configure their parameters (channel numbers, rates, antennas, etc.)

Once you have completed this process, you can analyze data as you normally do after a passive survey. If you are a novice in WLAN design, we also suggest that you read about Best Practices, Tips, and Tricks at the end of this chapter.

IMPORTANT: You must always verify that your WLAN design works as expected by conducting a real survey after deploying your WLAN. Predictive models cannot take into consideration all the factors that might affect real-world WLAN performance and therefore cannot fully substitute on-site surveys.

Remember that the accuracy of your results depends on the data you enter into the model. Ensure that you collect full business and technical requirements before you begin RF modeling. Know what types and numbers of client devices will be used, where and what applications they will use, and whether there are any mission-critical client devices that you need to consider. In addition, consider possible future changes and upgrades.