1. Wireless Network Visualization using Radio Propagation Modelling Johanna Janse van Rensburg Supervisor: Barry Irwin

2. Outline  Problems associated with 802.11  Security Risks  Issues related to setting up WLAN  What is Radio Propagation Modelling  How it can solve 802.11 problems  Methodology  Conclusion  Comments and Questions

3. Problems with 802.11  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

4. Setting up a WLAN  Antenna Selection  Density of users  AP location  Roaming  Security

5. Definition… What it is?  A model to visualize the coverage footprint of a wireless network in an environment.

6. Why it is necessary?  Wireless Network Planning.  Predict Signal Spill.  Predicted Performance.  Predict Channel Overlap  Predicted Coverage.  Auditing.

7. Methodology  Field Measurements – Data acquisition in free space and office environment  Comparisons  Visualization  Mathematical models  Environment, Floorplan or Outside.

8. 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)