Coexistence of 802.11b and 802.15.4a-CSS: Measurements, Analytical Model and Simulation

IEEE 802.15.4a Wireless Sensor Networks (WSN) and IEEE 802.11b Wi-Fi networks are operating in the 2.4 GHz band. In order to examine co-channel interference scenarios and the impact on key performance indicators, this paper combines an analytical model, measurements and simulations. It is a pilot study which reflects the interference caused by the new IEEE 802.15.4a-CSS (Chirp Spread Spectrum). An analytical model for adaptive bitrate adjustment and throughput optimization reflects the performance impact and the system behaviour of IEEE 802.11b. Measurements are used for model validation before simulation results show the system behaviour for changing node constellations, radio conditions and system setups. The validated simulation model is then applied to a use case scenario for indoor localization, which shows the impact on the performance of a realistic co-existence scenario.