Wireless Network Visualization using Radio Propagation Modelling Johanna Janse van Rensburg Supervisor: Barry Irwin
Outline Problems associated with Security Risks Issues related to setting up WLAN What is Radio Propagation Modelling How it can solve problems Methodology Conclusion Comments and Questions
Problems with Attenuation. Interference. Channels Multi-Path Propagation. Security features DOS attacks Access Points which haven’t been configured. Rogue Access Points and Clients that are unsecured. Signal Spill
Setting up a WLAN Antenna Selection Density of users AP location Roaming Security
Definition… What it is? A model to visualize the coverage footprint of a wireless network in an environment.
Why it is necessary? Wireless Network Planning. Predict Signal Spill. Predicted Performance. Predict Channel Overlap Predicted Coverage. Auditing.
Methodology Field Measurements – Data acquisition in free space and office environment Comparisons Visualization Mathematical models Environment, Floorplan or Outside.
Conclusion Administrator must have an understanding. Management Tool Wireless Network Performance Management eg. Low speed Transmission Rates Excessive Channel Noise (SNR) Access Points Overload Channel (rogue)